BitLord is a hacked BitComet client with spyware so I wouldn't recommend it. The BitComet client is also known to interact poorly with other clients (doesn't seem to favor upload to others easily).
Azureus is the way to go if you want a stable client that's widely recognized as a fully working one, dont forget that it also supports encryption which makes wonders.
uTorrent is quite good too but is a bit behind Azureus. BitSpirit is pretty much outdated today...
And if a client is banned, it's obviously for a reason, dont be an idiot and patch.
//Danne