Hi. I'm BigBugz' girlfriend. Sounds like I'm in the same boat as your girlfriend (5'10", 130). I haven't found a perfect-fitting diving wetsuit, but the Pinnacle I own is pretty good. A little short in the arms and legs, but when water's not too cold, it's ok (Pinnacle Fusion, 5-4mm, standard size, 8). I ordered a 7mm in Pinnacle in a "Tall" size, and it didn't seem to give me much more length.
I have, however, found the perfect fit in a surfing wetsuit made by O'Neill. All their stuff seems to run tall , but you can also order it in "Tall" sizes. Their brand (in 8 Tall) fits me like a glove. The suit I have for surfing is called the "Psycho 2" which is awesome, but probably too fragile and compressable for diving. Maybe you can check out/call O'Neill and see what suits they make that are suitable for diving. Don't let anyone talk you into a custom suit unless you dive a lot or if you have the cash to burn.
