I've got a Curt hitch on my 07 ZX3 SE and it's been good. I've had it on for about 4 years now and it is starting to show some surface rust. I'll have to clean it up this summer and repaint it but otherwise it works good. I got it from Advance Auto online and used one of their big coupons so it was around $75 or so with shipping to my door. That was by far the cheapest I could find for one.
For what it's worth I don't tow a lot with it but I do occasionally (probably 5-10 times a year) pull a single jetski trailer with it and that's probably 200lbs plus 400lb jetski so about 6-700lb total and it does just fine. I do get funny looks though... :)
2002 Mercury Cougar - Sport V6/MTX - Vortech/HMS/Centerline/Koni
2007 Focus ZX3 D20/MTX - AVIC Navigation/Alpine Amp/Infinity Speakers/ OEM SVT Sub - Gunmetal CSVT E1 Wheels - FRPP Suspension - Hitch
1997 F150 - The toy hauler