Hey Doug,
I'd say, for complete cycles my favorites are Uchida and Perahia. On a slightly low step of the podium I'd put Geza Anda, who I find is always interesting but not always convincing. I started with Brendel, and I hate to say I've outgrown him, but I feel like the others have more to say. And I've never been a big fan of Sir Neville.
For incomplete sets I really like the Szell/Casadesus late concertos and the Peter Serkin middle ones.
But my absolutely, positively most favorite are the recordings by Ivan Moravec.

On CD
Which isn't surprising because pretty much everything Moravec records is my favorite recording.
Of course that is very much JMO/YMMV and all that. I find the Mozart concertos a never ending source of joy and wonder, curious who you like?