I recommend Jack from
www.arcadesrfun.com. He's about the same price as all the other guys, but his stuff is customized to EXACTLY what you want for no additional charge! And he's awesome with suggesting stuff to help you build the control panel of your dreams. Again, highly recommended.
By the way, I ordered an X-Arcade tankstick XXL MAME Edition too, but I canceled the order in October because they kept pushing back the delivery date. (Back-ordered). I ended up using the $99 towards Jack's design and then I decided to save another $100 by putting the components in myself. It's easier than you think.
One last thing. I spoke with Scott Glazer from
www.mameroom.com on the phone today and it's official that he is taking over SlikStik's panel building. You can order a pre-made Slikstik panel from him and it will be delivered in no time. He is very reliable and has a good reputation.
Good Luck!
~ DeLuSioNaL