Recent build - Hard Drive Issues (long)

I recently built a system and have been having problems since the first week. Initially it started out as 1-4 BSODs a day. I ran the SMART test on the Samsung (Seagate) drive and it failed. I promptly got a WD drive as a replacement until the old one could be RMA'd. Everything ran fine for a few days and then the random BSODs crept back up. At that point, I ran memtest86+ to check the memory and it showed about 400ish errors on the second stick. I removed it and ran memtest on the remaining stick and everything was fine for 2 weeks. No BSODs - nothing. Yesterday, on a reboot, my mobo BIOS reported that the new HD failed SMART. Confirmed it with the Western Digital diagnostics. Specifically, its a sector allocation error. I ran chkdsk before I left this morning and will check it when I go home for lunch. At this point I am extremely frustrated. I've never had a problems with a build before and I am not sure where to look next. Motherboard problem? PSU issue? Do I need to RMA the drives/memory or can they be salvaged when I find the true culprit?

Here are the components:

ASUS P8Z77-V LX LGA 1155 Intel Z77 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard

Intel Core i5-2500K

COOLER MASTER Hyper 212 EVO

G.SKILL Ripjaws X Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666) Desktop Memory Model F3-10666CL9D-8GBXL

SAMSUNG Spinpoint F3 HD103SJ 1TB 7200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive

EVGA 012-P3-2078-KR GeForce GTX 560 Ti - 448 Cores (Fermi) Classified Ultra 1280MB 320-bit GDDR5 PCI Express 2.0 x16 HDCP

Antec TruePower New TP-550 550W Continuous Power ATX12V V2.3 / EPS12V V2.91 SLI Certified CrossFire Ready 80 PLUS BRONZE

SAMSUNG 22X DVD Burner SATA Model SH-222BB/BEBE

Microsoft Windows 7 Home Premium SP1 64-bit

added..

Western Digital 1 TB WD Blue SATA III 7200 RPM 32 MB Cache

Please help!