That is a very good power supply.
That is more than enough power for SLI and overclocking.
Tier 2 Brands - Top Quality components With Top Notch Stability - For Those With Price/Availability Issues With Tier 1
Antec Neo HE
Antec High Current Gamer Series
Antec EarthWatts greater than 700 watt
Antec TruePower Trio
Antec TruePower Quattro
Antec TruePower New -- 750w
Akasa PowerGreen 80+
CoolMax CTG-750 watt/850 watt/1000 watt
Cooler Master Ultimate/UCP
Cooltek CT
Corsair GS600 / GS800
Corsair HX
Corsair RM 550
Corsair TX
Corsair VX
Cougar SX700 and GX700
Enermax Liberty
Enermax Infiniti
Enermax MaxRevo 1350
Enermax MODU82+
Enermax Platimax (600, 750, 850, 1.2K)
Enermax PRO82+
Enermax PRO87+ (500w + 700w)
Enermax Triathlor (550, 650, 700)
Enhance ENP-GH
Fortron (FSP) GLN
Hale82-m 650-750w
iStarUSA PD2
iStarUSA PD3
LEPA G500
OCZ EliteXStream
OCZ Fatal1ty 
OCZ GameXStream less than 1000 watt (only if manufactured in December 2007 or later)
OCZ StealthXStream 400 watt
OCZ StealthXStream 2 greater than 700 watt
OCZ Modstream (only if manufactured in December 2007 or later)
OCZ EvoStream
OCZ ProXStream
OCZ Z(t)(s) Series Less than 1000W
OCZ ZX 850w
PC P&C Silencer less than 610 watt
PC P&C Silencer MkII
Rosewill Capstone (450, 750)
Rosewill Fortress
Rosewill Hive (550, 650)
Seasonic G series
Seasonic S12
Seasonic M12
Seasonic Energy Plus
Sentey Golden Steel Power 850w
SevenTeam ST less than 600 watt
Silverstone OP/DA 700 watt or less
Supermicro/AbleCom
Thermaltake Toughpower greater than 600 watt
Thortech Thunderbolt Plus 800w
Topower Powerbird 900w
Xclio StablePower
XFX Core Edition
Xigmatek MC
Xigmatek HC
Ultra X3
Ultra X-Pro
Zalman ZM less than 1000 watt
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