Bill Miller has posted a Kirkey Road Race seat for sale in your price range:

http://itforum.improvedtouring.com/forums/...topic=13829&hl=

I'm using a Kirkey Intermediate Road Race seat. The rib protectors do lend themselves to some "elbow rubbing", so I modified it a bit. It's better but not the best. I was once convinced that the aluminum seats were the only way to go, but I've raced in a MOMO, Sparco EVO2, and a Cobra (all composite seats), and I think they are better from a comfort standpoint. May no be the equal of the aluminum in overall safety though.