Compressed Air Tank - Which one?

[MattPaintballer]

I think I have decided on a Crossfire tank. One thing I heard about them though, is that the older ones sucked. I have found three that I like: the 72/45, the 70/45, and maybe the 68/45, but preferrably 70 or 72. But I don't know if any of them are old/bad or anything, so any help would be appreciated. 72 cubic inch, or 70 cubic inch, that is the question

72 cubic inch (the one in the middle)
http://www.warpig.com/paintball/tournament/iao/2002/techgallery/MVC-598S.jpg

Or the 70 cubic inch?
http://www.thepaintballstore.com/media/crossfire70ci4500redstubby.jpg

[rx2]

I am not sure what you have heard about them, but I personally haven't had any problems with them.

[MattPaintballer]

Okay thanks.