All depends on where you're going to use it. Sprint's EVDO is currently the broadband network to beat for coverage. Cingular's UMTS is the network to beat for speed but has very limited coverage. If UMTS covers most of the places you'll be, that's what I'd do. Failing that, go Sprint EVDO. They have coverage over most metro areas. EDGE is not comparable. It's much slower and much higher latency. EDGE is basically GPRS with reasonable speeds.