The x560 (I have one) is quite excellent. It is both cool and quiet. Yes it isn't cheap by far, but I think the quality it brings to the table is simply exceptional. I'm probably going to try to push the limits of my own with a i5 760 + GTX 460 768mb SLi soon.
Would the ASUS P8H67-M Evo or the ASUS P8H67-I Deluxe be a better mobo for the i5 2500 non-k processor? You are correct.. I don't really plan on OCing.. but get a better PSU? I thought the X-series was up there in terms of quietness and performance?
Why are you wasting money on high end gimped motherboards if you don't plan on OCing? There's absolutely no point unless there's some extremely vital feature you need. It's almost like buying a Ferrari, putting in an engine from a civic and never taking it over 60.