Which Braille are you using?

[rossmacd]

Those of you who are using braille batteriess... Which one are you using? I'm strongly considering getting a 2618, but an also considering a 3121. Where did you mount it? I think I may put mine in the front fenderwell area, because it would save me 10 feet of 00 wiring, which weighs a ton. I've got an optima in the trunk right now, but with the large cable, it's difficult to install cleanly in my interior.