Which Seasonic PSU to buy?

[majax]

I have all of the components I need for my first ever PC build. However, I still can’t figure out which PSU to buy. I’ve decided that I want to get a Seasonic platinum series because I’ve heard that they are quite (no coil whine) and they have a good warranty. I’m choosing between either of these two:

660(SS-660XP2)
760(SS-760XP2)

Currently, I’m thinking about the 760XP2 because it’s only around $20 more than the 660 at Newegg. I would appreciate any thoughts on these two models.

Here are the PC components I’ve purchased:

HARDWARE

CPU: Intel Core i5-3570K Ivy Bridge 3.4GHz (3.8GHz Turbo) LGA 1155 77W Quad-Core Desktop Processor Intel HD Graphics 4000 BX80637I53570K
http://www.newegg.com/Product/Product.aspx?Item=N82E16819116504

Motherboard: ASUS SABERTOOTH Z77 LGA 1155 Intel Z77 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard
http://www.newegg.com/Product/Product.aspx?Item=N82E16813131821

Video Card: EVGA GeForce GTX 670 FTW 2GB 256-bit GDDR5 PCI Express 3.0 x16 HDCP Ready SLI Support Video Card 02G-P4-2678-KR
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130787

Hard Drive: Western Digital Caviar Black 1 TB SATA III 7200 RPM 64 MB Cache Internal Desktop Hard Drive Bulk/OEM - WD1002FAEX
http://www.newegg.com/Product/Product.aspx?Item=N82E16822136533

CPU Cooler: COOLER MASTER Hyper 212 EVO RR-212E-20PK-R2 Continuous Direct Contact 120mm Sleeve CPU Cooler Compatible with latest Intel 2011/1366/1155 and AMD FM1/AM3+
http://www.newegg.com/Product/Product.aspx?Item=N82E16835103099

SSD Hard Drive: Crucial M4 CT128M4SSD2 2.5" 128GB SATA III MLC Internal Solid State Drive (SSD)
http://www.newegg.com/Product/Product.aspx?Item=20-148-442

Memory: CORSAIR Vengeance 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Low Profile Desktop Memory Model CML8GX3M2A1600C9
http://www.newegg.com/Product/Product.aspx?Item=N82E16820233186

Optical Drive: Lite-On LightScribe 24X SATA DVD+/-RW Dual Layer Drive IHAS424-98 - Retail (Black)
http://www.newegg.com/Product/Product.aspx?Item=N82E16827106335

Monitor: Dell UltraSharp U2412M Black IPS Panel 24" 8ms Pivot, Swivel & Height Adjustable LED Backlight Widescreen LCD Monitor 300 cd/m2 DC 2,000,000:1 (1000:1) http://www.newegg.com/Product/Product.aspx?Item=N82E16824260047

Speaker: DELL UltraSharp and Professional Series 468-7412 10 W 2.0 AX510 Flat Panel Stereo SoundBar http://www.newegg.com/Product/Product.aspx?Item=N82E16836260002&Tpk=Dell AX510

Case: Fractal Design Define R4 Black Pearl w/ USB 3.0 ATX Mid Tower Silent PC Computer Case
http://www.newegg.com/Product/Product.aspx?Item=N82E16811352020

 

[pqwoerituytruei]

the 520w model would be plenty for that system with power to spare
your case has plenty of space to hide cables no need to pay extra for a modular PSU
now if you plan on SLIing a couple 670s then go for one like a SS-750AM

 

[Bobnova]

For that setup, a 400w PSU is plenty. Between the two listed, get the 660, that's plenty even if you toss a second GTX670 into the mix.