Are you going to ride it primarily on the road or on the track?
There's your answer man. Twitchy, aggressive geometries are great but some can find them uncomfortable for long road rides.
+1
If you're just riding 10 miles and hanging out at bars, go with the track geo and forget about it - the chicks dig the super aggro riding-style, amirite?
If you're going to be doing 50+ milers to build up base miles and can see yourself putting out hundreds of miles in just spinning each week, might I suggest the road geo.?
Also, if you build it from scratch, even the cheapest frame is going to cost you that $800 in getting quality parts pretty easily; building a bike is like buying a used boat. Even if you have spare parts, you're going to be soaking the problem from your checking account long before you're "done."
Edit: Yes, people can and will show you how, through a series of catching deals, ebay or accepting the cheapest part to fill the gap you can build a bike for less than what the homeless make panhandling near the highway - you have to decide if you're really going to do that - or if its just going to sound good until you get started.