I've had the Lee aluminum presses and the cast iron. The Challenger isn't a bad press, but for a little more the classic cast turret is my favorite. I especially like the primer catch tube that runs through the ram.
The 50th anniversary is a solid kit, but for about $100 more the Lee Classic Turret Kit is pretty hard to beat and upgrades just about everything. Too bad it seems to be sold out most places!
http://www.grafs.com/retail/catalog/...roductId/23840