You could try Sasugabooks.com. They do special orders for rather decent prices. Just check out their site, and if they don't have the entire set available, email them and they can give you a price before they special order it for you.
Oh crap... it's this question again... ermmmm... okay... here we go.
Well, if any of the complete series that I own are any indication of my favorite manga... there'd be a few:
-Dragon Ball
-Hokuto no Ken (Fist of the North Star)
-Gunnm
And I own *most* of...
-Jojo no Kimyou na Bouken...
um... Hi...
My name is... Japanese... and I... basically picked it myself...
You can choose any number of Kanji to read it. Some ideograms are more common than others, and some aren't. It really doesn't mean anything though, but in an abstract kind of way, you can pick several combinations...