5MB is more than enough d00d.

But to be safe, 15+ (for pr0nz etc.)

Ping will not change with bandwith, ping is more a measure of distance/infrastructure than connection speed (and subsequently a pretty poor measure of performance).

Any stable broadband connection would be fine, 512kbps up/down would work no problems. 256k might even be good.

Yesterday i was registering uploads of upto 20KB/s, today its barely gone over 10, with the average being 7-8 (3v3 game, yet to try a 4v4). Even a 128K line will -just- about cover it.