It's already been explained that it's difficult to provide a "straight answer" because you haven't provided all the details. The specs of your server must be recorded somewhere - in a welcome email, in your hosts billing/control panel, etc...
In general though $335 does sound on the high side, unless you've got something like dual Xeons with 8GB of RAM and the 200GB is mirrored with hardware RAID.
Chances are that's not the case though...
How long have you had the server? That's another thing to consider. Many hosts will keep charging you the same amount every month even though the hardware has been depreciated and 100% written off and their other costs such as bandwidth have actually fallen. In this case it's not a bad idea to ask the host to renegotiate your plan, or provide an upgrade. Have you looked at their site lately?