Which Sprint Phone Should I Get?

[Red05usa]

Hi. Lately, ive been thinking of the perfect phone for me. After buying a laptop and ipod touch, ive realized that im on the run a lot, and its really hard to find wifi internet connections when i need them on the fly. So, ive finally remembered, that a while back, people used to use their cell phones (tethered in by annoying wires and slow [fast at the time] speeds) to give internet. Then, after more research, ive realized that you could even turn a lot of smart phones into mobile wifi spots, which is extremely intriguing.

Currently, i have an LG rumor. A piece of crap that doesnt really do much of what i like, but its a phone. However, i want to upgrade to something (with my main goal of it) to be able to turn into a mobile wifi hotspot (making phone calls, and sending texts too of course >.> ). Knowing almost nothing about which phones could do it now (i know the original HTC touch was a godsend), i was hoping someone could tell me which phone is the best for my needs. If i have to swap off sprint then thats what happens, but im assuming theres great phones sprint has to do what i need.

(Edit: my current plan already has unlimited data etc)

Thanks in advance.