need advice on getting a new bike
I have been riding a converted road bike for the last 2 years and finally have the means to upgrade to something new and more along of the lines of a "track" bike. I want something with tighter geometry and much lighter and a more aggressive ride. I would be riding this exclusively in the city and i ride every day, rain or shine. After talking with friends and coworkers I have been trying to decide between either getting something relatively inexpensive and "okay" (KHS flight 100, or ebay Mercier), or spending a little more ($600 +) for something that I'll maybe love, is SOLID (IRO, DiBernardi, Surly) ,and will be worth the price as far as the quality of the components that it is sold with.
My only frame of reference is my beater fixie which is a little rickety and noisy but I always keep it running.
I would love to hear opinions from owners of some of the brands i mentioned, telling what they really like about their bikes and how they ride.