Didn't know where to put this, as there isn't really a forum to say "thanks for great service"
Just bought a co2 system from the people at http://www.4x4rockshop.com
Those guys are great! I wanted some extra options after I ordered, and they totally took care of me... after my tank had shipped! I'd recommend them and their most excellent customer service to anyone.

This is what I bought
http://www.4x4rockshop.com/scripts/prodView.asp?idproduct=2388

I figure we don’t hear enough about good service, so I thought I’d post my expierence.

They even sell Xterra parts
http://www.4x4rockshop.com/scripts/prodList.asp?idCategory=135