That seems a little bit high. I haven't gotten around to getting mine yet, but my local car audio and accessory shopped quoted me about $200 for a viper remote start, and another $25 for the Ford PATS security override, installed.
For around $400 installed, you can get a good viper alarm/remote start combo.
I would look around a little bit more and try to find some cheaper places.
here in bergen county NJ, the high price capital of the world, I paid $500 for the viper alarm/autostarter with the Mini remote with LCD screen installed.