I too started with PI-5, upgraded to 6 and I'm now thinking of upgrading to 8 because it has some photo-editing upgrades in it. I'm curious as why you're disappointed though. I'm assuming you're pretty adept with PI-6. Are you aware of Stephanie's PhotoImpact board and tutorials? There are many hardcore users there that would give you a better dialog and answers. It's here:
Personally I like PI much better than PS because it's more user intuitive (& waay cheaper). Of course, if you learned PS first, you might not find PS so daunting, but IMHO it's too obtuse to solve problems quickly and effieciently like PI, which I prefer for 90% of things.