2wd saffs are great cars, and massive fun in the wet!! The speed difference between 2wd and 4x4 is shocking really, a stg 1 270ish bhp 2wd will keep up, maybe even edge away from a stage 3 4x4.
Whatever car you buy, get a decent rear beam for it! Don't listen to the horror stories of 2wd cars being uncontrollable, just be sensible where you use the power!!