My short answer is, get the G10 full set, then putter. Or vice versa.
Otherwise, I would go driver, putter, irons, 3rd wedge (replaces hybrid), 3 wood.
Driver: I think the G10 is great; seems like more play the R9. It's longer, but not as accurate. Putter: Many players say this can wait, but IMO you take more shots with the putter than any other club, and the smaller meter increments and better precision make a huge difference. Wedge: Get one to fill the yardage gap between PW and 60 degree (the G10 set solves this problem, ditto on the 3 wood). If you get a set you can keep the hybrid for occasional use (it's free, sort of) or sell it back, which lowers the set price a bit.