You're right about there not being a lot of great reissues, but that's why this pick was such a let down for me. Wish they would have done something worth it. If I really want holy ghost, I'd probably grab a 12" single of it.
I think the Baby Huey reissue is AAA. I've heard good things about the Craft Isaac Hayes reissues. I only have Hot Buttered Soul and it's pretty good but I'm not sure about AAA. MoFi Superfly should be good, again not sure of source. It's a shame the ORG There's a Riot Goin' On is out of print, it is pretty great too. Although, I think that highlights an issue that a lot of funk isn't necessarily recorded to the best audiophile standards anyway.
For that reason I'm generally happy with originals, especially when they're cheap.
I really wish some great reissue company could get their hands on some P-Funk releases. They couldn't have lost/damaged all the tapes, could they? That would be a tragedy.
At least there's some good Jazz-Funk reissues. If I'm forgetting any great quality funk reissues I'd love to know.