i don't know about dma but i would go with SATA or serial ATA ( same thing just some places call them diff). you can only use SATA if you have conectors for it, i think that is a great deal though. i'm gonna buy a 37 wd raptor for my new computer, i say go with wd, my dad has one and a maxtor and i think the wd is quiter, the maxtor is the slave though i think.
what ever is close to the raptor 37, i don't know exact numbers but it's close.