For around 450-500hp, RAM makes a great clutch kit. It's about $275.
Best buy right now for a 500-550-ish hp car is a RAM Powergrip. The pressure plate won't break your leg and the disc isn't that aggressive. Off the top of my head, it's like $325-330 and comes with the throw out bearing and installation tool. The equivilent in a McLeod would run about $450.
Best buy for around 600-650hp would be the Powergrip HD, but it uses a sintered iron/sintered iron disc which is a flywheel eater. If the car sees a lot of strip time, this one isn't bad, but if it's street, then I'll usually recommend a McLeod setup with an 800 series Kevlar disc.
Over 650hp, it's a McLeod RST twin disc setup.....or if it's strictly a drag car, then it's a RAM adjustable pressure plate and a metal disc. Fun stuff.
Y'all have a good night....I'm heading to bed. Don't forget to set your clocks forward one hour.