The BAT kit IS great. I have it on my Mystique & drive it every day. The ride is quite firm with my 225/45-17 tires, but not bone jarring. VERY stable & capable, but not as comfortable as the stock setup. If you have really bad roads where you live and don't HAVE to get a performance upgrade, you might be better off stock, I think.
If you want a nice performance upgrade and your roads are not too bad, go for the BAT kit, definately. The BAT kit is a wonderfull all around upgrade. CTA prices are very fair from what I've seen. Grab a set before the price goes up.
If you want the comfortable stock ride and to save a buttload of cash, the value struts are the way to go.
Choice is yours.