Mb Abit IS7G, 4Gb Corsair DDR2 1066 RAM, Core2 Duo 2.4 6600, dual 35Gb Raptors in RAID 1, 450W ps, Lian Li A05N mini ATX case. Upgrading XP to Win7 Pro. 64. Applications: video streaming, stock charts, web surf, email. Cost matters. Want to add WD Green 1T internal, and Iomega 1T 34280 eSATA (auto backup) external drives. Contrast 2 solutions: lose RAID, 1 Raptor + WD Green OR lose Raptors and add 2 WD Greens in RAID. Thanks for insights.