My narrow definition of a "big" is someone who is 6'10 or taller, and plays the "5" position. Broader definition would include Strong Forwards.
I overlooked TJ (don't know how, he was so recent) and Tito Horford. Izundu is worthy of a shout out too. Collins (even though more like 6'8), did play inside. Also, Tim James, who - on second thought - maybe was our best "big."
Kadji, more naturally a stretch 4, would also qualify. As would Darius Rice. Kamari Murphy was a solid SF. Tyler was maybe 6'7 on a good day and, like Bland, operated well out of the high post.
Gamble had size but when I think of Julian I recall that nice, little mid-range jumper he had and not physical dominance. Popa, for all his awkwardness, scored well with that hook shot of his and, at 7'4, could be a terror blocking opponents' shots.
I'm sure there are more just not coming to mind. Bottom line is we haven't - in 30+ years - had many bigs who could dominate on both ends of the court.