as far as collecting star wars figures...good luck getting them ALL. they put out so many exclusives a year...you're bound to go crazy trying to get them all. plus all the vehicles, 12" figures, playsets, delux craps...oh forget about it.
then you get 6 of the same figure...luke with hat, luke with cloak, jedi luke, luke with blaster, luke with battle damage, luke with...you get the idea.
my suggestion to you is...funk hasbro! maybe pick up a few of those little figures for fun. stuff like marmit, kotobukiya, fine molds(model kits), medicom, and code 3 can get a little pricey, but at least you won't get stuck with 20 variations of the same character ie luke with new pose! or some retarded char that shows up for 1 second in the films.
in short, buy what you like and can afford, stay away from buying all SW figures, somewhere down the line, you'll regret it.