Also, other AlNiCo JBLs for considerably less. 2215H/J, 2220H/J, 2231H, and, as previously mentioned, the K140 and K145.
I have some 2220H drivers. They're high efficiency, high output drivers. Very loud, lots of midrange, lacking a little on the low end. I also have several D140F drivers, and they're not as loud, but have a better low end.
I have another Sunn 200S cabinet with ceramic magnet drivers, and the internal baffles are intact, so other drivers can fit. Depth can be a factor, for sure.