I used fireworks for my first couple of months in graphic design. But once you learn how photoshop works and can get fluent with it's shortcuts and abilities you wont regret switching to photoshop. Trust me. Yes, fireworks is easier and faster for a novice person but if you're ready for a program that has way more features and customizations.....photoshop is your future. I wouldn't recomend photoshop cs2 there isnt much difference besides the font preview option in the font drop down box...I have all of them I usually use cs2 but it's not worth the money imho.
hope that helped!
-spaz