For rifles, I like the RCBS Rockchucker. I am in the process of setting up to load for the 7mm Magnum now. It usually also removes the spent primer. The next die seats the bullet to its proper depth. The last die crimps the case to hold the bullet properly.
Rifle dies are different, combining the seating and crimping operations into one die.
Pistol sizing dies are usually made with tungsten carbide, so you don't have to lube your brass. A triple-beam type is fine and it is less expensive than the electronic, but the latter sure is nice to have. It must read in grains. They are absolutely mandatory. The trouble is they only give data for their own bullets.