I also wouldn't suggest trying to save a few bucks on the PSU. For $16 more, you can get a PSU from a more reputable PSU vendor. These suggestions add only an extra $21 to your list and, in my opinion, improves the system.
I think it depends on what you want to do with the system. The A6 has better onboard graphics and is a quad core. The i3 is probably better for gaming, but if you are planning on doing that, you would probably have to get a graphics card. For non-gaming stuff, I would probably go with the A6. It really depends on what you want to do though.