uk mod supplier
www.xdvds.lunarpages.com/xbox/index.php
my uncle has used this site had a courier collect the xbox was chiped then sent back via courier. he's very impressed with the service.
also as far as backups go. if you use the data burn method ( check stickys) you can directley copy from that backup without needing to ftp. however if you use iso method you will have to ftp each time or keep the game on you'r pc hdd which takes up valuable space.