Martial arts/self defense classes

I'd like to take some to mostly strengthen up. Thing is, I'm pretty much the beginner's beginner, and I learn comparatively slowly (not gifted w/ hand-eye coordination). 

Any good suggestions in Houston? Good teachers that won't get frustrated, good pacing of the class, etc. Adult classes of course. I'd prefer Southwest or West Houston. Any other details you guys can provide would also be welcome (pricing/age ranges of classes).

Thanks guys :)