Budget build - which frame? '99 Cannondale CAAD3 or '04 Felt F90?

I have been undertaking a build for a "throw around" bike using parts that I have laying around. The bike was going to consist of a beat up '99 Cannondale R1000 CAAD3 frame with a carbon Slice fork. However, last night I came across a stupid good deal on a clean '04 Felt F90. The only thing wrong...