My shelves are also full. I haven't bought a manga since October for this reason (well, also because I spent more money buying other things :lol)
Behind these big piles are some Eyeshield 21, FMA and Gintama volumes.
Kinda the same problem, i just moved to Paris (or near enough) and I usually have big piles of mangas sprawled everywhere....in my hometown.
You know the joke in Futurama about the garbage crisis where they go and say
"Garbage fill was filled, New york was filled, New jersay was filled... "
Well it's kinda like that.
My room at my parents' is filled, my sister's house is filled, my friends' houses are filled.
But since I moved where I'm now my so wants to have everything on hand (which goes with me wanting to get them all here).
So we're filling libraries (and in february we're going with a car to get 2 huge boxes (6 to 7 20/30 volumes for capacity I think) filled mangas up here).
And the fun part is that we're missing essentials like Dragon Ball, Naruto or Akira even
And I NEED Berserk too....
Will probably be starting Death Note soon too (read it but didn't own it yet...)
edit : you've got a pretty cool collection!
I don't see hunter x hunter or Vagabond but that's a really good collection (and you don't have Fairy Tail and that's good because goddamn it's shonen trash)
Although I don't see a lot of shojo too (then again I get a lot of flack from everyone for that :lol and I don't care Kare Kano is awesome)