I see the SE/30 as the special edition "turbo" edition of the SE - with a good chunk of RAM (20MB+) and a faster than stock HD, it performs so much better than a standard SE or Plus. OS 7 is responsive and the crisp monochrome screen is something that will be marvelled at in terms of retro computing collections as the years go by.
Are there any B&W apps/games that make use of the '030? None I can think of. It is worth upgrading to faster accelerators? No, this as you can't run anything else.
If you are looking at a more usable vintage Mac, a souped up CC is a much more capable machine. Coupled with a 640 x 480 mod and '040 Mystic upgrade, you can run pretty much any piece of 68K software made (pending compatibility), it's small and serves as the perfect bridging Mac between older 68K and early PPC machines. Don't forget it!
Edited by Byrd, 14 November 2017 - 05:03 AM.