I'm trying to put together a car to go carpet racing.

What is the best front end I can get for the standard 1/12 mounts? CRC Prostrut? BMI Copperhead? Serpent?

Also are there other economical methods of upgrading existing older style front ends like the CRC front end prior to the Pro Strut?

I'm not very familiar with the various types of front ends out there other than the AE reactive caster units that came originally in the RC12L3. Can someone give me an education and history of the reactive caster front ends?