Router: Any dual WAN routers suggestions? My goal is that if one connection goes down the other one will automatically pick up the job
UPS: I have no idea. How much W do I need for this system? I'd like to be able to use the system for a few mins in case of a blackout.
My thoughts on this build:
The motherboard seems like a waste since I'm not going to use the sli capabilities. However, I really like the aesthetics (black/red) because I've already purchased the thermaltake level 10 case. I have no idea about ram so no input. It seems that a lot of ppl recommend to overclock the 920 so I might do that.
^ Well dont you think that Level 10 case was exuberantly priced one ?
If it had anything to do with your work, then paying a high price premium might make sense if it provides any additional advantage...
So does the other components that you have chosen...
As a business machine, it doesn't look like you're trying to go cheap on anything that matters. It isn't the biggest, but Signature still appears to be the best (but Seasonic X is 80+ gold and almost as nice otherwise). The SG-850 is outstanding, but overkill as GKay suggests. His little brother, the SG-650, reviews just as impressively. You don't say how many drives you'll be getting for storage, but the Signature comes with LOTS of cables.
If you want a smaller PSU, check out a Truepower. The 550W model is enough, but strangely is the same price as the 650W model right now. Or, choose a 550W -650W Corsair.
Unless you'll be gaming after hours (you did say "exclusively for work" though), you don't need a GTX 260. If you prefer nVidia, even a 9600GT will suffice. If you think you might want to run three monitors though, check out the ATi HD5750. For just two, even a HD4650 is enough.
A 1000VA to 1200VA UPS will allow your system more than just a few minutes; probably a good 15-20 minutes of run time. I have four UPS units myself (my PC, network bits, wife's PC, and bench), and all are APC. I'd also buy Tripp Lite, but not many of the cheaper ones; definitely not Belkin (anything!).
If you're going to overclock (I'd be cautious on a business machine), you may wish to consider lower voltage RAM. You're already at the Intel limit of 1.65V, so you have no headroom. Since the limit may be as much wattage-related as voltage, since they are linked (P=IE) you may want to start out with a lower voltage.