I would choose the core 2 quad q9450 and above over any phenom II really at the moment. There are going to be new chipsets for the Phenom II's but anustly sata 2.0 is fast enough, and clock for clock the q9450 and above perform better basicly the Phenom II's.
Also essential if you get one of the newest batches intel has realeased in 09 or the newest batch you will be doing 4.0Ghz under 1.25volts threw processor. My loads on my q9550 at 1.232 volts 65 run of intel burn test maxmium stable, are around 51-55c on a hot day. I tested today and the first two runs i never broke 50c in inteburntest. Over all the Phenom II's are cheaper they are getting new chipsets and AMD will be realeasing 6 core processors for the same motherboards your purchasing for your Phenom II's
But i have a rape q9550, so im going to stick with my q9550, and say core 2 quad is the way to go, faster clock per clock, and put it on a x48 board with ddr3 and bam you get Phenom II am3 with a core 2 quad.
Go to microcenter, look for the latest batch q9550 and buy it for 169.99 e0 stepping 08/1/09 packing date or even earlier and i have a great suspicion that processor will blow the door's of a Phenom II for 24/7 clocks.