Hi Illuminum and welcome to your addiction,
This is a topic that comes up pretty regularly and there have been great discussions on the topic.
Up in the blue car, under Search, try "which kit" or "which manufacturer" and you'll see several recent threads on the topic.
Not to shut you down, I love my Superformance and would buy 2 more if I could, but it's just kinda a recurring subject, you know? IMHO, SPF (Superformance) offers the best quality and originality looks for the money.
You're entering a great time of year for a Cobra purchase, you can get some deals. If you haven't yet, check out
www.cobracountry.com. They have a bunch for sale.
Hope to see you out there cruising soon!