These server PSU's are very loud so take that into consideration depending on where you will be running your miner.
The S2 is so loud that I can't imagine the server PSU having too much of an effect. I wish I'd gotten the S2 in late December, it would have done an awesome job keeping my garage at a good temp!
Become a NewEgg premier member. For $50 a year, free 3-day shipping, discounts on 2 and 1 day shipping, and free return shipping. I've been a member since it became available about 2 months ago, and I've already recouped the cost on shipping. 
I did the shoprunner thing Newegg was pushing before. If you cancel during the trial, they offer you a chance to extend it for 3 months (totally free) which automatically turns into a year if you use the service 3 times in that 90 day period. On top of that, shoprunner will give you a full free year if you have an AMEX card. I've been getting it for free for a while and still have about a year left of free, I think.