The only thing I would do if you want "ultimate" Macintosh II-with-Apple-parts is to use an 8•24GC video card, it was essentially *THE* IIfx video card. (Or, if you can get your hands on one, a 24AC, which really is just a re-branded Radius - but it is the "ultimate" NuBus Apple-branded video card.)

Obviously, you should have an Ethernet card, too. I don't believe Apple ever made a 10Base-T NuBus Ethernet card, but they do have one with an AUI port and a 10Base-2 port.

Dang, that reminds me that I need to get the NuBus PC Drive card. I have the drive, but not the card.

And, as far as I know, no Macintosh II-era speakers. The earliest speakers I know of were late Quadra-early Power Mac era. http://en.wikipedia.org/wiki/PowerCD#AppleDesign_Powered_Speakers