depends if your feeling lucky, you can overclock the E4400 to ridiculously high clockrates if you get a good chip, but the 5600 isnt a bad alternative
Yea, Intel's chips have made overclocking so easy these days there is no reason not to overclock. You can hit some high speeds with them without much increase in voltage. However the 4xxx series use more voltage than the 6xxx series. You could easily hit 4GHz. Just search the forums. There are tons and tons of guides that people have written on how to overclock the c2d series. Find a good one, possibly one that even uses your motherboard as the example, and go for it. The basic principles are the same. As for waiting . . . hmmmm. I'm not really expecting anything spectatular to happen in the next six months. Call me pessimestic, but Penryn will not be much faster than current chips, and I think if AMD had something special they would be releasing chips for benchmarks. Last I heard, they were only launching chips up to 2 GHz or something like that. Correct me if I am wrong but if that is true, it is most likely that is because they can't get them to run faster than that.