having owned several pairs of the 25, 44, 15, 15xr and the 66 i can catagorically say something must have been wrong with the 66 mid for the 25 to win, the mf500 (or md500) and hf2000 combination is amazing, the 25 and 66 both share the same woofer/pbr, but i suppose beauty is in the ear of the listener.
44 should have the hf2000, if not dont touch unless they are very cheap, sealy you may have got confused with the 33.
imho i try and avoid the 33 but i do really like the hf1100 which is a black silk dome. horses for courses. ditton 15xr is much prefered over the ditton 15.
ditton 10 is junk status.
hf2000 used in spendors etc has a different impedance afaik