Yeah, Planet-Zero in Houston does not have a IIDX machine. The owners are trying to gauge interest, so if you're in the Houston area, or just in Texas in general go register at their forums and let them know they'd receive your business for a machine.
Here's the bemanistyle link, and the link to Planet Zero's forums.
OMFG! I'll have to go there! Hell I'll even give up my beer money for it! :P
Edit: I've never been there before. How far from US 46 is it?
Re-Edit: Not far at all it seems...so it's pretty much a straight shot from my house
From what I understand, it should be installed sometime Friday evening. There's actually a tournament on Saturday (both PIU and IIDX) that was going to be on their 8th mix.
Out of curiosity, how on earth did you find an upgrade from 8th? I've been looking for a long, long time and I'm sure many other machine operators here have also...