any < $100 current nvidia cards should be plenty for your needs, the vast majority of them have at least 2 outputs and any from a solid brand (evga, asus) should fit the bill, say something like the GT610 fanless which for 2d like HW uses would be even better from a noise standpoint
If you don't mind questions about your list of components
- if you are going for x79, why not 64 gigs of RAM right away? it is difficult to get 64 gigs to play nice and it is easier if you do so if you purchase them all at the same time since they would all be the same, also why ecc?
- if you are going for x79 why a quad-core CPU? the 4820K is only quadcore and a lot less performant than something like the 4970K which also uses less power
- when it comes to PSU note that PSUs are at their most efficient when they are run at about 50% load, a 650W PSU would be running extremely underloaded for just HW, since there is no video card draw, I would suggest a 450W tops, say a corsair CS450M
basically from my perspective for HW you have a choice of
- going for LGA2011 with a 6+ core and 64 gigs of ram
- going for LGA1156 with 4 core and 32 gigs of ram
going LGA2011 for 4-core and 32 gigs of ram seems like a lot of extra money for significantly less performance, also considering the LGA2011 socket is at the end of its life as far as I know due to Haswell-E using a new socket (and having an 8-core CPU too)
I am also not sure about going with ECC ram as that is a significant additional expense, but that is definitely a decision for the buyer in terms of comfort: from my perspective if extremely occasionally a home computer crashes due to a ram issue (which would happen extremely, extremely, extremely rarely for quality ram) one can always reboot, of course for a church installation it's a different kettle of fish.