DescentBB

I've had D3 for ages, and am keen to get some multiplayer games in.
Unfortunately, all the servers have.... 250ms ping or so. And D3 will kick you for too much ping if you are over 200.

Any suggestions?

No, D3 does not kick for "too much ping".

What you're running into is an AntiCheat feature that kicks players who have their PPS (packets-per-second) set too low. Go into the launcher, set your connection to "T1" (this is 12PPS) under the Network tab, and you won't get kicked.