i completely understand where your coming from. my collection is spread across 2 states, some in storage, some at parents house, and the more current stuff in my current place. lol.
In the past year i went complete opener after years of keeping everything carded. Also i try to not buy any multiple sculpts, and I'm even trying to cut down on picking up anymore main characters, Luke, r2, etc. Later this month i will be taking a trip to storage and will be sorting through my carded collection. Most of it i figure will be sold or traded.
I collect the basic line, the mighty muggs, sideshow 12", The GG Animated statues, and now the indy line. I've been tempted to start the marvel muggs, but i just remember how much stuff is coming at the end of July. I'll be picking up the at-te for sure as well as the animated clone war figures.
the BMF Falcon has me thinking about unloading my saga one from a few years ago. although I'm sure alot of people will be doing that so I'm not sure it will be worth it. lol.
I think the real trick is to try to collect what you enjoy the most without feeling like you have to be a completest. like said in previous posts "Easier said than done"