A couple of sites to help your research.
The big names:
Horton
http://www.crossbow.com/
Tenpoint
http://www.tenpointcrossbows.com/
Excalibur
http://excaliburcrossbow.com/
Barnett
http://www.barnettcrossbows.com/
Parker
http://www.parkerbows.com/pb/
I would stay with one of there names (I hope I didn't miss any or someone is sure to get mad)[8D]
They all have strengths and you may have to shop around or get a more basic model to stay under 400 for the package...just like your compound it is nice to add the little upgrades and extras.
Mitch