PSU Purchase Advice...

Their both Seasonic built PSUs. It's really a toss up. Here are links for you to decide yourself.

[H] Enthusiast - Antec NeoPower 650 and NeoPower 650 Blue
Corsair TX650W ATX12V power supply | silentpcreview.com
 
The Corsair has a single rail with 52A. The Antec has 3 rails of 19A each, but combined they also give 52A, not 57 (you can't just add them up). Quality is similar. I'd get the Corsair since it's cheaper.

 
Just a thought - the Corsair has it's fan mounted on its "bottom" and the Antec has it's fan mounted on its "top". I forgot to mention that the case for my build is the Antec 900 which houses its PSU on the bottom of the case. I'm thinking that if I go with the Corsair that I'll have to at the very least turn the thing up-side-down - at the worst it may not work...
 
Does this build seem pretty solid to you guys? Thanks!

Qty. Product Description Unit Price Savings Total Price
1 Antec Nine Hundred Black Steel ATX Mid Tower Computer Case - Retail
Model #: Nine Hundred
Item #: N82E16811129021

Return Policy: Standard Return Policy

In Stock
Mail-in Rebate
$139.99 -$20.00 Instant $119.99
1 GIGABYTE GA-P35-DS3L LGA 775 Intel P35 ATX All Solid Capacitor Intel Motherboard - Retail
Model #: GA-P35-DS3L
Item #: N82E16813128059

Return Policy: Limited 30-Day Return Policy

In Stock
$109.99 $109.99
1 SILVERSTONE SST-ST56F 560W ATX 12V 2.01 & EPS 12V Power Supply - Retail
Model #: SST-ST56F
Item #: N82E16817163112

Return Policy: Limited 30-Day Return Policy

In Stock
$94.99 -$5.00 Instant $89.99
1 Intel Core 2 Quad Q6600 Kentsfield 2.4GHz LGA 775 Quad-Core Processor Model BX80562Q6600 - Retail
Model #: BX80562Q6600
Item #: N82E16819115017

Return Policy: Processors (CPUs) Return Policy

In Stock
$219.99 $219.99
1 G.SKILL 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model F2-6400CL5D-2GBNQ - Retail
Model #: F2-6400CL5D-2GBNQ
Item #: N82E16820231098

Return Policy: Memory (Modules, USB) Return Policy

In Stock
$84.99 -$40.00 Instant $44.99
1 Western Digital Caviar SE WD5000AAJS 500GB 7200 RPM SATA 3.0Gb/s Hard Drive - OEM
Model #: WD5000AAJS
Item #: N82E16822136178

Return Policy: Limited 30-Day Return Policy

In Stock
$89.99 $89.99
1 SAMSUNG 20X DVD±R DVD Burner Black SATA Model SH-S203B - OEM
Model #: SH-S203B
Item #: N82E16827151153

Return Policy: Standard Return Policy

In Stock
$29.99 -$5.00 Instant $24.99
1 Tuniq T-120-LFB 120mm CPU Cooler - Retail
Model #: T-120-LFB
Item #: N82E16835154002

Return Policy: Standard Return Policy

In Stock
$69.99 -$20.00 Instant $49.99
Subtotal: $749.92
 
All around it looks good. Just to let you know, the WD5000AAJS is a slower driver, meant for something like 24/7 operation. The WDs ending with AAKS has more performance. The best one would the double platter 640GB.
 
I think you may be right about the Xigmatek. Per frostytech it would appear to outperform the Tower 120. By the way thanks to the both of you for the suggestions - they are very much appreciated! cheers-