I'd still need a PSU. I'd like something that is quiet and built with enough quality that it's not going to fall apart. Hopefully with some headroom for if I want to add a GPU later. I was looking at the Corsair HX650W, but I think it's overkill in both price and performance.
I'd also consider a different case. I've built with both the 300 and a Coolermaster Haf 912. Currently, the 300 is $20 cheaper (after rebate).