I just finished a sideboard for the kitchen for the wife's birthday - 56" wide, 20" deep, 41.5" tall. I splurged on the Kreg Pocket Hole Jig ($139 version). Used it to build the carcass, the front face, and to edge join 1x12 and 2x12 planks to make the shelves (17.5" wide) and working top (20" wide). If you have not tried it, I HIGHLY recommend getting one. It not only makes the jointing a pleasure and very strong, but the clamp in the base makes a great third hand for holding work in progress.
I've been considering getting a bench top jointer for some time - it would have made the top and shelf joints a little cleaner. A nice square edge would also improve the pocket hole joints (although they were pretty good just using the chop saw). I looked at the Jet 8" Jointer/Planer, the Porter-Cable 6" jointer, and the Ridgid 6 1/8" jointer. Grizzly also has a bunch available.
I would appreciate hearing your thoughts on a machine that will do a good job w/o breaking the bank.