Anti-sway bars and tower strut bar is the best bang for the buck without your wife noticing the car is lowered or rides rougher.
Several places to buy Eibach, here are 2:
http://www.genxmuscle.com/store/EI2860-320
http://truckperformance.com/products/?productID=400601
Need to purchase the Eibach rear hardware kit too, part #2860.320HKR or buy all the stock pieces from your dealer.
OEM Parts list compiled by Gear Head:
PT Cruiser GT Turbo
Parts List: Rear Sway Bar Parts needed for Aftermarket Rear Sway Bar
Part# Description QTY(ea.)
04656927AA---------RETAINER Sway Bar------------------------QTY-2
04656940AA---------RETAINER Sway Bar------------------------QTY-2
06504010-----------SCREW & WASHER Hex Head, M10x1.50x35-----QTY-2
04656934AB---------LINK Sway Eliminator---------------------QTY-2
06506496AA---------BOLT Lower Link to Sway Bar--------------QTY-2
06506509AA---------SCREW,Hex Head---------------------------QTY-2
06502696-----------NUT,Hex Flange Lock M10x1.5--------------QTY-4
The hex flange nut you do need 4 of. 2 extras for bolting the sway bar bushing bracket to the rail between the wheels.
Just FYI:
H&R Anti-Sway Bars are coming out soon and the rear is adjustable like the Eibach. Rumors has it having 3 adjustment holes for the rear bar.
www.tirerack.com has them listed already for special order. But, as always, H&R will probably cost a bit more.