Our clan used to use xgameservers but they are an overpriced POS company that treats it customers like crap! mad:
We are currently using
http://www.clanservers.com
I find them to be extreemly helpful, stable, and well priced.
I have never had a problem with them that wasn't fixed that day!
The company founder is also very nice and helpful. I would reccomend contacting them for a server.
My 2 Cents.