I use and love Yamaha mixers.
Actually 350 watts is fine for a S115V, and unless you’re really gonna crank it, it should still have sufficient overhead.
They even sell that combination as a package
http://pro-audio.musiciansfriend.com/pr ... sku=630208
Heck, I ran two of those and two PV118 subs on a Yamaha powered mixer (400+400), each speaker getting only 200watts in a bar (24'x72' listening area) and couldn’t turn it near all the way up.
I think the Yamahas are great powered mixers, and with the new compression feature, personally, I wouldn’t even look at another unless I already was using a compressor.