there are 3 types of GPS navigation systems that i'm really interested in... 1. Streetpilot 7200, Streetpilot 2720, Streetpilot 2820 2. Roadmate 700, Roadmate 760, Roadmate 3000T 3. Tom Tom GO 910, Tom Tom GO 700, Tom Tom GO 510 now, there are 9 GPS navi's that i like but obviously their 3 diff., brands... can somebody help me out? i really need to know which one is the best. i heard all of them is really great and helpful when getting lost, trying to find a restaurant, ATM, etc...