The R-44 JBell pointed you to is an excellent choice. Rugged, four-channel, reliable.
If you want something a bit smaller, the Roland R-26 is also four-channel, but with only two of them providing 48V phantom. Still, you can do an SBD feed for channels 3&4, or use an outboard pre.
I don't think many Oade mods are being done on newer decks, but if you wanted something smallish, I think Oade mods the Marantz PMD661, and by all accounts that's a nice 2-channel P48 machine.