Didn't expect you would go with such a low-end motherboard. Since you were looking at the Z170 Pro earlier I assumed you were looking for a board of better quality around the Z170 Pro's price.
Option 4 would be wait until Zen's release, but it sounds like you're already having issues with the performance of your PC. And Zen probably won't be released until somewhere between October of this year and possibly February of next year. So, doubt you'd want to wait that long.
Frankly, I'm eager to see what they come up with myself since Bulldozer, Piledriver, and Vishera haven't really performed up to their hype.
Because it's compatible with the memory he has now if he chooses to reuse his current memory.
Thought that might be a cost-saving option, since the poster of the thread did mention they were concerned about their budget constraints.