Will you ride track or mainly on street?
Go with whichever one you think you'll be happier with (as in the end you probably will). Definitely go ride an aluminum track frame, though, to get an idea as to whether you prefer aluminum or steel. This should be a top priority if you haven't already.
Read these for more info (and please do so that my search for you doesn't go in vain!).
http://www.bikeforums.net/showthread...ight=buy+build
http://www.bikeforums.net/showthread...ight=buy+build