If you're willing to overclock, the Asus V8420S, which is a Ti4200, will overclock to Ti4600 speeds easily for $140
But of those two, I'd have to say FX5600 Ultra, just because it's so much better at AA and AF... and I'd rather be able to maintain 85 fps in more games, than get 300 fps instead of 250 with no AA and no AF in Quake 3.