I can go for anything, it just depends on the situation.
For DFC, I can stand it (though I'm not that much of a loli man, I'm the guy who goes around here screaming about MILFs all the time). For DFC, it has to be something nice, not like man-chest.
In general, B-C cups are nice, but it depends on the shape. 2D girls do not have this problem. 3D girls do.
D+ cups have to be nice and the girl has to be SKINNY. Healthy Drive is OK, but I cannot stand fat girls with big tits, it makes me want to vomit.