Combined 12V is 45A, kinda low for a quality 650w if you ask me seeing as Corsair's 620w model has 50A.
But that's not the best deal.
prices
All 3 of those are less than $100. Fry's also has shipping and/or tax.
Seems like none of those 3 stores have more than a handful in stock. I wonder if these are still made by Seasonic
Anyway, this isn't the greatest of deals, however if they come out with discounts and rebates for these to make them $30-$50 after rebate, then it'd be a different story. As of right now, for ~$100 you can get the better Corsair 620w or 650w (50A and 52A on 12V rail) at many places. With a measely 45A, you might be able to do sli or crossfire with the lower power draw cards. If you are going to buy an Earthwatts, you might as well go with a 380w or 500w (whichever is cheaper) because even the 380w is enough for an oc'ed cpu and a single power hog gpu like the 8800 gtx.