Hi there and welcome to BioRUST. I started with
PS version 6, then moved up to version 7. Like you, I stayed with 7 for quite some time, but then made the leap to CS2 and have never looked back. Don't get me wrong - 7 is a great package and generally did everything I could ask for, but the enhancements in CS2 aimed specifically at digital photography work are especially useful to me - don't know how I'd manage now without the Lens Correction and Smart Sharpen filters!
Anyhow - hope you enjoy your stay here, learn some new tricks and maybe let us see some of your work.