Sorry, FD, quite a bit of us build our own, hence the lack of resouces for OEM machines. However, if I were to buy a prebuilt, it would definitely be based on the new Core Duo 2 seies of processors. While having more horsepower under the hood over the current champ, AMD X2 series, they also run just as cool as them, much cooler & draws much less power than the P4 series they are succeeding...
Pudding wrote
Another vote for Intel Core 2 Duo E6600. Best bang for buck, with nice OC possibilities. I'm waiting for Paul to get his hands on one to put it through its paces. :)
Sorry dude, it was a paper release for the Core Duo 2, with just a handful of cpu's alloted to retailers. I was only able to snatch up a lowly E6300 with a paltry 2MB l2 cache...

It's been up and running for the better part of a week, seen here- http://setiathome.berkeley.edu/show_host_detail.php?hostid=2580953 I'm waiting for some new ram to come in, I really can't spare any of the 3 very fast modules I currently have, they are installed in 3 D's crunching their little hearts out. Already, just running 2650 mhz, the little E6300 is outcrunching my D's @4 Ghz by about 25%. There's more left in the chip, the ram is holding it back...
Paul