It's is easy to assume Cantu will automatically improve upon 05 but as everyone has said, I think he will be very overrated in 06. He did seem to turn things around starting 04 so his power might be real.
But his plate discipline will drag down his average considerably. He doesn't run either so at best he will be a 3 category player in fantasy.
"Think of how stupid the average person is, and realize half of them are stupider than that." ~George Carlin