Triathlon - What's more important in a Tri-Bike:aero or weight?

After being side-lined by an injury for this entire season, I'm still trying to get set for my first sprint Tri. While unable to ride a bike, I decided to build one. Here's my question: In a typical Sprint Tri, which is more important for a bike, less wind resistance or less weight. I'm primarliy a roadie, so the only thing that would qualify either bike as "tri" is the Profile Jammer GT bars I'll put on the bike I decide to train with. Here are my options:

2005 Trek 2300 - aluminum with carbon stays and fork, FSA 50/34 compact, 12-25 rear cassette. Ultegra. Definitely the lighter of the two. Race-Lite wheels

19?? Author A-4 - all 7000 series aluminum, but with smaller tubes overall, and an aero shaped downtube. Ultegra 53/39, 12-25 cassette. 105 save the crankset. Bontrager select wheels. Though I haven't weighed them, I'm sure it's the heavier of the two bikes. Don't have quick access to a scale, and this one is still being built. Here's a photo of the frame though. It started as my project bike on a budget.

http://i70.photobucket.com/albums/i116/tigerbike97/frame02.jpg
(Please don't mock the wallpaper, I'm renovating :) )

Thoughts? My intsinct is the Trek, but as I've never actually competed, so I don't give my "instincts" much credence.

Thanks for the help

Well the most important part aero-wise, is your body position on the bike, rather than the aerodynamics of the bike itself.

A good point. If that's the case, and both frame geometries are very similar, so assume that my aero position on each would be the same (or very similar), then which frame would you go with?

Aero is more crucial but
aero wheels
aero helmet
aero body position
are the important factors, not so much the frame. More info is needed, is the course flat or hilly, will you spin out on the compact? If you have enough time to train in a aero position on your aero bars and get the feel for it, then I would say the trek with clip-ons and what ever wheel is more aero.

Screw both....you need a good paint job for a good bike. The sexy-ness may not be fast, but it makes you look and FEEL fast, that's what counts....actually going fast hurts...

Aero is more crucial but
aero wheels
aero helmet
aero body position
are the important factors, not so much the frame. More info is needed, is the course flat or hilly, will you spin out on the compact? If you have enough time to train in a aero position on your aero bars and get the feel for it, then I would say the trek with clip-ons and what ever wheel is more aero.

I agree with the premise, but not necessarily the conclusion. Because Rider position is the biggest factor, I'd take the Author frame, and build it up as a dedicated TT bike with aerobars, and a position dialed in for time trialing. ( and keep the Trek set up for road riding)

Screw both....you need a good paint job for a good bike. The sexy-ness may not be fast, but it makes you look and FEEL fast, that's what counts....actually going fast hurts...

Well yes, we all know that red makes you go faster; that's a given - no point in mentioning.

But one should look to a combination of redness, aerodynamics, and weight.

For example (http://www.totalcycling.com/ProductDetails/mcs/ProductID/1105/GroupID/1/CategoryID/138/v/72e04974-cbbc-404a-800b-1e4bc5b603bc/curr/en-GB) - Bell Meteor II available in red!

Well it is not just one or the other, rather a ratio of one to the other. You can have the most aero bike on the planet, but if the build weights 30lbs, the 18lb not so aero bike will kick its a**. So now it is in finding the balance between the two. True aerodynamics is also different from not quite so true. For example, Cervelo uses aerofoil shaped down tubes(think plane wingish), whereas earlier desings on other companies simply added a tail to a round tube, so in aerodynamic terms, it gives you almost nothing. You need to decide for yourself what are you going to be using this bike most for. Say it is mostly for triathlons(this being the correct forum then), what kind of triathlons, like what is the bike like. If it is all over the place(lots of very different courses), I would say go for the road bike to start. That will give you the most versatility. Very hilly areas, road bike. Mostly flat areas, go TT/Tri bike frame.

I live in a pretty hilly part of the country (SC), so road bike for me either way. Both of these frames are road frames, so I guess the only real way for me to find out is a head to head comparison. I know the Trek weighs less, but I don't yet know how much. The bars are Profile Design Jammer GT clip-ons, so I can try them on each setup. I don't know enough about frames to say whether the Author is truly aero, or just a standard tube with a "tail." Based on the estimated age of the frame, I'm guessing the latter may be true. It will be an interesting comparision, as the setups are a bit different (10 Speed Ultegra drivetrain with FSA compact crank vs.9 speed 105 drivetrain with Ultegra 53/39 crank).