since you're spending money on at least good SSD / RAM, i'd move up to Kaveri. whichever one is on sale at a good price. i briefly looked at the 5150/5350/etc but it seems it's just too.... low-end? budget? i dunno, considering how much better Kaveri or a Pentium G is, i'm not sure it's worthwhile as a product. builders still need to spend a few bucks on memory, cases, power supplies, etc, so saving $20 on the cpu/mobo isn't huge.
now, if you're reusing old stuff from the bottom of a box in a garage, then a 5150/5350/whatever is a cheap quick way to get something built.
do an exercise - put together a sample build that you'd be ok with using the 5350, and then do the same using an A8-7600 or even A4-6320 or whatnot (FM2 / FM2+), and see what your total cost is for one versus the other. how much do you save overall, in dollars and in percent? sometimes an exercise like that puts things into perspective, especially if you're having to buy other parts as well.