I'm a big fan of the Detolfs. Affordable and they look great. I have 4 - the first two were bought before IKEA introduced the black color for them, so I just painted them that color. The other 2 were bought in the stock black color. Two of them house my 12" Sideshow stuff (except for Jabba and the like, which sit next to them on a coffee table), one houses my Kubricks and the other is for my animated maquettes. They're filling up quick though, so I might need to grab some more.
I remember a while ago that someone posted a shelving unit with glass doors and shelves that mounted on the wall. It' was really cool. I think it was from Ikea, but I'm not 100% sure.
This it? I have one of these for my loose collection consisting of three shelves of vintage, one shelf of the VOTC/V30th figures, one shelf for my astro droids, one shelf for the McQuarrie figures and two each for GIJOE and Cobra. There's room next to it for another one once that gets filled (and like the Detolfs, it's getting there quickly).