At a guess #400 front #600 or #650 rear. Others will have their own opinions I'm sure, mine are Hall/Aldan Eagle with #400 fr & #680 rr and I definitely feel the potholes.
I would say just don't do shocks in isolation and expect great handling improvements, it's about finding an overall package. Get the 7/8 uprated rear sway bar and those end ball caps for overall better handling. Or go for the 1" front and rear sway bars if you really want to go all out handling.