Seagate SATA drives are running a little slower than higher performance PATA drives. But on par with common PATA drives. What they do have going for for them, is it's SATA and makes it more common compared to Raptors on the price factor, but performance as I've heard it isn't anything to write home about.
Raptors for their high cost show what the performance benefits are. Honestly, I won't be buying SATA til they bridge the gap and give better performance at a reasonable price. But that's my own opinion on the matter. You won't be losing points for "only having PATA drives" for another year or two I think.
So if you're looking at SATA for performance, Raptors are your best bet.