What PSU to picK?

Been looking at these two for my new build

Silver Power SP-S650 650W PSU ATX 12V V2.3, 80 Plus Bronze, Standard, 4x 6+2pin PCIe, 6x SATA, 5x Molex

And

XFX ProSeries Core Edition 650W PSU ATX 12V V2.31, 80 Plus Bronze, Standard, 2x 6pin PCIe, 2x 6+2pin PCIe, 8x SATA

It has been difficult for me to find reviews, so I'm left to the forums.
 
Both PSU models are made by Seasonic based on Seasonic's S12II/M12II Bronze platform.

Both have the same maximum combined +12 Volt continuous current rating of 53 Amps.

Both have the same 80 PLUS Bronze efficiency.

The Silver Power SP-S650 has a 2 year warranty and the XFX ProSeries Core Edition 650W has a 5 year warranty.

I don't see any reputable reviews of the Silver Power SP-S650 since it's one of their new models.

Reputable reviews for the XFX ProSeries Core Edition 650W:

http://www.hardwaresecrets.com/article/XFX-PRO-650-W-Power-Supply-Review/1165

http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story&reid=216

http://hardocp.com/article/2011/01/31/xfx_pro_series_core_edition_power_supply_review/