Hi, I'm not sure if you have already found a bike, but I have a 50 cm Felt S22 that I am selling.
It hasn't been ridden much, and so has low miles and is in great condition. It would be perfect for someone looking for a mid level tt or triathlon bike, but doesn't want to spend thousands of dollars. The reason I am selling it is because it is slightly too big for me, and so was never able to dial it in exactly
All the specifications can be found here:
http://www.bikepedia.com/quickbike/BikeSpecs.aspx?Year=2007&Brand=Felt&Model=S22&Type=bike
The original MSRP was $1969, so I'm thinking around $1000, but am willing to negotiate with reasonable offers. Let me know if you are interested.