Regarding reward points, I'm building mine up, but didn't bother registering on my first two flights to Asia
I'm now with AF/KLM Flying Blue, Emirates and Saudi's reward programmes. It probably doesn't really make sense to use 3 different schemes as the points can't be used anywhere else.
I've got enough for a one way to Manila with KLM, as long as its half points on one of their promotions or enough for a return to the NE USA or Canada, I might take up the latter option as one of my best friends lives in Maine.