yes, I would second detritus and Felix's notion. I was considering a similar move, but decided to suck it up and save up for K5 (or whatever model's out by then). Not to mention I'm also caught in a situation on saving the funds for Body upgrade or get the lenses I want first.
Logic and advice from friends say, get most of the main lenses I'm aiming for as the new camera body upgrade path will be evolving faster than most of us (sans deep pockets) can keep up with. Just my 2 cents on the matter. =)