you're not going to get less heat output for similar power unless you go for a gulftown or, even better, wait for sandy bridge. gulftown you could probably run around 2.8-3.0 and try to undervolt it, but you'd need an entire platform upgrade to save a little bit of heat. do you need that much oc on your cpu or can you slow it down a bit? maybe you could go for running the 9650 at stock speed and seeing how low you can drop the voltages; I'll bet you could get down to 1.0-1.1v. that would probably cut your heat output in half and still give you nice performance.
What video card do you run? my gtx 260 puts off as much heat as my i7 920.