Best Aftermarket Suspension Set-up

Good point. A coil over conversion is all in cost wise, at the time of install. Upgrading a stock system can be an incremental effort if you need to work on a budget.

A coil over system will drop some pounds off the nose of the car with increased steering feel, both a definite positive. However, it may also give up some rigidity and allow more chassis flex which aren't desirable traits.

if you need to change spring rates for an activity, coil over springs can be found at any swap meet for $50 a pair. T-Bars are going to run you $500 a pair new.