IT Support monthly Costs

I have a local IT company providing my office with a server, running Win server 2008, with Active Directory, Exchange, and Sharepoint installed for the 25 users in my office.

the initial costs for the hardware and installation of the software, and hardware seem ok, but the monthly management fees are quoted at $1500 per month. this covers them to maintain and support the windows server, active directory, exchange, sharepoint, as well as 1 cisco managed switch, 1 cisco router, and a VPN connection to another location. We have people in the office for general employee issues with printers and basic stuff like that.

is that $1500 dollar monthly fee in the ballpark, or is that a crazy price.