i am exactly the same, need speed but am a complete noise freak (a few seconds faster rendering isnt worth me getting distracted by noise).. having owned raptors before i know how noisy they can be.. so this time i went for Samsung Spinpoint F1 drives.. one as a system drive, and 2 more in a RAID 0 set, i don't know if the raid is any faster, more for convenience really. But i'm finding the F1 as system drive to be excellent, it's really FAST, very quiet (I have 3 of them and i haven't been bothered once), and it's a 1TB drive. Highly Recommended!!
check out the benchmarks at tom's hardware, this drive is faster than the raptor for everything except Server/Database actions... and yes there is an imminent raptor update so wait for that, in time being get some 1TB action going.