The Novitec ones seem perfectly fine, albeit7k on set of Sports Catalyst is a little rich for my liking. Im used to paying around 3k on my previous Masers and Ferraris.
Novitec is overpriced on everything, I can't blame you. "Hey they own a Ferrari let's mark it up 5x!" No thanks Novitec.
An alternative is to contact HJS Motorsports and find out what they have. They have universal 200 cell cats for tuning purposes and 100 cell cats for motorsport purposes. I believe Fabspeed uses HJS. Can't see why a good performance shop should not be able to mount a set of those as long as they have good fabricators.