I've got to say, Chuck's right. But I really like Mance and he's very consistent.
Personally I like his Chiaroscuro albums, particularly "Blue Mance" - the only studio one among them. All the others were done on board ship and feature some nice guests, too.
The material I've heard on Sackville is good, too. "Junior Mance special" is a solo set, part live. "Jubilation" is another solo set, all live.
The OJCs are fine, too, but watch out for the twofer "Junior Mance trio & orchestra" - that's pretty duff, actually. But you should be able to pick up any of the OJC releases cheap from an Amazon seller.
I also like his Atlantic material, though I suspect many won't. If you want some Junior that's really doing heavy Acid Jazz, "With a lotta help from my friends" is a hell of an album - Gale, Rainey, Cobham.
There are some good albums on Japanese labels, too.
"Opus de funk" with Frank Wess (Absord)
"Holy mama" (East Wind)
"Soul eyes" (M&I) is my favourite Mance.
MG