They really are fun to play with. I have the ProChrono Pal ($110 at Cabala's with free shipping if you have a Cabala's card.) and it does everything I need done. Just be sure to buy or make a shield if you shoot sabots over it. Also, a cheap second hand store camera tripod makes it easier to set up.

A shield is easy to make if you have some plexiglass. Drill four hole for the rods and bend it with heat from a torch. It looks like this.

http://www.amazon.com/Competition-El...ords=prochrono