The highly rated Corsair TX650 (made by Seasonic) is on sale for 59.99 with free shipping after $30 rebate. I believe historically this price has been matched, but never beaten, and always with a rebate. If you are rebate adverse, this isn't such a good deal. In my opinion, this is the best power supply of this capacity for under $100.

 

This is a non-modular 80+ power supply with a 52 A. 12 volt rail. It is the perfect size for a 20 drive unRaid.

 

Reviews:

 

http://www.silentpcreview.com/article813-page1.html

 

Tiger Direct:

 

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=3438607&CatId=1483

 

It looks like this will be good until 9-14.

 

 

Newegg:

 

http://www.newegg.com/Product/Product.aspx?Item=N82E16817139005

 

Code: EMCYXYX64

I have this same power supply and I love it.  It's quiet and I've had no problems with it whatsoever.

So many good deals... I have yet to outgrow my current but aging power supply with 2 12v 40 Amp split-rails (a waste of a 12V 40 Amp rail since it's for PCI-Express Video), but this almost too good to pass up.

 

 

I have this same power supply. Highly recommend.