Hi,
You may consider IEP hosting (http://www.iephosting.net/). We're indeed not beating that $575 for 1 mbit capped but with us you get what's _really_ important in the adult business:
SPEED AND RELIABILITY.
I guarantee you we're one of the fastest ones out there and since we host our own sites on the server too, it guarantees you we will always stay the best! :-)
Feel free to go take a look at
http://www.iephosting.net or to contact me...