I have the BHK 300 monos and they are absolutely wonderful. I have not heard the 250 but from past experience, I know how stereo and monos versions of the same amp can sound different. With the extra power comes an ease of delivery. Bigger sound, more air, better separation and more depth. If the money is not an issue and you have any doubts, GET the monos and be done! Ha! We are never done but I love mine and they are not going anywhere.
Please keep us posted.
Please keep us posted.