I only have a third that amount and I already have trouble just using one in a day.
EDIT: and I have two more in the post, one of which is a Model M. Cannot wait for that to get here.
The shine 3 is a pefectly good board if you need it now, but if you can wait, and actually like the huge knobs on the shine 4, then go for it. Personally I hate the knobs and won't get another Ducky until they get rid of them.
I think I've made my decision, going with the M50. The sub $200 price also leaves me a bit of headroom for shipping from PCCG as well, which is usually a little expensive and I didn't think of when I started the thread.