I think open door closed door is misleading- it suggests a 180 degree arc.
I think this picture(stolen from TST's Detour review) best illustrates the style
It really depends on your stance, one would have to see it. I'm 5' 5" and i use a 32.5, but I was using a 35, until I got fitted and found out i need a 32.5
Personally, I like the Studio style over the studio select. However, you should really decide on your own, and try the select out yourself.
PS- new Custom shop options let you change the cherry bombs to blue or green
I can honestly say I like the Studio Style better. I think the insert actually adds to the feel and, I think there is better touch on short putts. That being said, they are both very similar putters, and, chances are, whichever one you chose, you probably wouldn't regret the decision.