Ok so I've recently acquired a Canon Rebel XS with the kit 18-55 lense. I really believe the potential for this camera is held back by this lense so I'm going to look for another glass option. My question is, which is the ideal lense to get if I would like to upgrade from the kit lense? If this helps any, I'm looking for an "all purpose" lense. I wanna do portraits, I wanna catch action, and I wanna blur the hell out of the background! lol any thoughts or advice is greatly appreciated.