I was going to get the RMi 750 w PSU for its modular designa and 80plus gold standard. Is this a good PSU for my build? Would anyone recommend anything else is it is not? Also, is this motherboard good? I am not over clocking so just want a reliable board that will serve me a good few years.
The RM750i is very good choice. I have an an RM1000i and I am very happy with it. You could also get a HX750 which costs slightly more than the RMi series but is 80+ platinum.
Get 80+ gold/platinum 750> I'd take a 850 just in case of upgrades and also I dont like upgrading my psu. Gold is totally fine too btw so if I were you I'd probably get the corsair rm850, some fractal or coolermaster V850.
RM 650 is inaudible for what you will use. I have a similar PC in terms of power draw (i7 haswell, gtx 770). It never goes past 50% usage so the fans are always off. I highly recommend it.
The only downside is that you pay a bit more for the brand instead of better quality components (some people shun Corsair for not using japanese caps). But to the end user none of that really matters. Read the review on Jonnyguru if you're not convinced
Oh and my instant power consumption went down from 150 or so in 2d desktop work to ~100w after switching to this from an 7 year old Enermax 550W 80 plus. EDIT: good read on PSU efficiency