Id suggest a Fuji Track Pro/Comp. Very easy to find one at a Performance Bike shop discounted especially if you can have them source one that is from 1-2 seasons ago. They come decently spec'ed, the frame is stiff and aero, and pretty lightweight.
I just started racing at Marymoor Velodrome in WA and there are easily dozens upon dozens of beginner to elite level riders on Fuji Track Pro's.