Why not use PathPilot? All you need is a Mesa 5i25/6i25 card, a PC with the appropriate slot and the PP USB stick to upgrade. The total amount to Tormach is either $185 or $225 depending on the chosen Mesa card. Most any off-lease PC with a HD and 4GB will be sufficient. You plug it together and it just works without any special configuration required. Is that significantly more than a UC100 and hours of futzing around?