I limited my upstream bandwidth usage (while speeding up browsing on the 770) by using Slimserver's playback rate limiting feature to down-sample MP3s on the fly. Using this feature, you can set the playback quality at 64 instead of 128 or 196.

No matter which route you choose, having your own music stream to the 770 is pretty cool. Now if I could just get a longer lasting battery for my 770.