bench Belt sander (as big as you can afford, wish mine was bigger) Bandsaw, i have a 12 but would prefer a nice 14" (there is several good brands)
I find uses for my "Lam grinder" every day, it trues, parallels and mine was made from spare parts, 2 bearings and a few cheep pulleys, its not a necessity but i love it. not a power tool but dont forget the Japanese draw saw, 4 way rasp and thumb plane. they get a lot of use around here. I also would not give up my mouse style sander, i would like a profile sander. table top drill press and grinding drums for it.
The most important power tool i have and the only thing i could not do with out is my two RIGID shop vacs... I have two that's right, both with hepa filters that clog quickly but completely eliminate dust. Its really nice to grind with one vac hooked up to the grinder then clean up the boards and area with the other, the first is guaranteed to be clogged. At work we are very hard on vaccums, Rigid's are the only ones that ever hold up. plus they have big hoses plus they Suck like a champ. they cost alot compaired to all the other small shop vacs and you need the 5hp motor but it is worth it.