I seriously doubt the ProChannel equalizers exhibit any audible artifacts, Allan. If you're hearing something out of the ordinary, I'd suggest investigating that before spending money on EQs. Try the Sonitus EQ. No spectrum graph, but it's a good EQ.
If you're determined to get a different equalizer,
FabFilter Pro-Q2 is about the best there is, IMO. Pricey, but very, very good.