I also upgraded to a split keyboard and I love it. I really liked the Microsoft Natural keyboard, but slamming my mouse into the number pad was driving me crazy, so I decided to get a split keyboard without one. I have the Kinesis Freestyle Pro. As a bonus the mechanical keys are nice to type on! My only complaint is it takes a moment to get it dialed in for placement if it's been moved.

Which split keyboard ? I was also looking for one, all pre-build starts from #350