Where are you located? I have to be honest with you, for what you are trying to do, for the price you can't do much better than a late 80s or early 90s Schwinn lugged frame. I've owned a handfull and my current favorite is a 1986 Tempo. With Shimano Light Action group, GLX cranks (double) and fairly heavy Weinmann rims it still weighs around 22 lbs. I is Columbus Tenax. You can research Columbus Tenax, it is decent stuff. Opinions vary, but it is said to be at least similar to Columbus SP.

There are or were, a couple of nice frames on Chicago CL. One was a Premis and the other a Circuit, both very nice.