[LAU] What processor to buy?

Hi All, I'm looking at buying a barebones kit for around $250 US. I'm looking at the amd 64 x2 6400 or in the same price range, intel's core 2 duo e6300. I've read a lot on the internet and I've learned enough to know that I'm very confused. I just want to record audio using Rosegarden, Zynaddsubfx, Qsampler and dssi plugins, I'd also like to do some video editing with Cinelerra. What about this phenom thing? Anyway, if anyone has some recommendations regarding these processors and possibly some motherboards to go with them, I would greatly appreciate it. I don't do gaming so that's not an issue. Thanks, Arthur