I game on an AMD A10-5800K and it is definitely "good enough" for my needs (I'm into racing games and flight sims, but from my limited gaming knowledge I don't think your games would tax your system).
I've got it on an ASUS A85M-Pro and find it easy to use and it has simplified OCing. I like ASUS's fan control system too.
Been reading lots about PSU's lately (see
PSU Calculators and while I'm no expert by any means on this from what I've learned, unless that video card is very power hungry then the 850 is serious overkill. Curious about why you would make your own cables? Wouldn't the ones that come with the PSU be "good enough" for your "good enough" system?