Mountain Biking - What frame to start with for a xc/dh bike

I want to start to build up a bike that I can use for xc and taking drop offs and such, but still to be able to keep up reasonably on the downhilling at places like Whistler. I've been looking at a couple of frames but am kind of stumped on which one would be better to use. I am trying to find a frame either new or used for around $400-$500.

The FSR; I've rode my dads FSR and really liked it but I have read reviews about the frames that being able to put up with a lot of beating.

The K2 EVO 3.0 and 4.0; I've read reviews about the frame being good but I have never really heard about K2 besides skiis.

The GT I-Drive; Probably the 3.0 or 2.0. Again, I've read good reviews but I haven't really heard anything about GT bikes except their going out of business.

Or maybe I should use the Univega DS-900 I have and just junk all the componets and start with its frame? I just don't know if I can get enough travel out of the rear.

Any other brands I should check out? Any tips or suggestions would be appreciated. Thanks

the best thing anyone can say is to just try them all (if possible) and go with the one you like best.

Hi, I just wanted to give you a review of a bike I bought. I bought a Jamis dakar comp, right before a dh race. Its not a dh bike, its a strong trail bike....it took a beating in the race, and through all the practice runs. Then you throw a pair of slicks (what I have on it now) on the bike and you can ride it xc very well. It weighs around 28 pounds. Nothing has gone wrong with the bike, the manitou fork still works like new, the xc wheels are still true, the disc brakes work well. If your interested at all, you can post here again or email me at mimtnbiker@email.com.

I was about to give a bunch of suggestions until I reread the post and saw your price range. I haven't ridden the Jammis but I have read reviews and heard really good things about this bike. I think it may be your best option in the fs frames in your range.

I had links to pics here....but the losers at pinkbike deleted them.

Heres the GT

And the Jamis... took the pic way off center...lol

look at the 2001 khs fxtpro or comp. come speced with coilover shock and 4"of travel. very nice frames