OK let me add a few followup comments.
1. It's great to recommend original recordings but my experience is that the majority of them are in terrible shape; that's opposed to classical LPs where either the owners only played them once and put them on the shelf or had some better tables. I've returned countless jazz LPs that were graded as mint or NM. I can count the number of classical albums returned on one hand in the last five years.
2. I highly recommend the MM and Analog Production 45 rpm series. I've compared some to 15 ips tapes and they are very good transfer. The main thing I hear is that the LP is a little lighter sounding and brighter. The LPs are even slightly closer to the tapes thru the Allnic phono section.
3. Fantasy is hit or miss. Some good, some bad. I also think Verves are a little better than you give them credit for. The tapes sound much better than the LPs. Listen to the 45 rpm issues and one hears some of the sound issues probably stem from poor transfers/vinyl. Verves tend to somewhat veiled with a pronounced bump in the low midrange of voices giving them an unnatural chestiness. That said, Oscar Peterson We Get Requests is to die for! Some other great recordings/music on Verve include Mel Torme I Dig the Count/I Dig the Duke, Gerry Mulligan Meets Ben Webster and Ella Fitzgerald Clap Hands Here Comes Charlie.
4. Contemporary is underrated. As Steve Hoffman told me, these albums were recorded in Contemporary's mail room after hours
The best sounding Contemporary is Benny Carter Jazz Giant. Great musicians backing him and great sound!!! Very close to the tape! The tape just has a little more palpabality and less mechanical feel to it.
5. I give the Impulses a slight edge over the BNs. As Steve Hoffman related to me, most of the BNs are recorded very hot and there's some tape overload. My favorite Impulse is A-1 with JJ Johnson/Kai Winding (not to mention Bill Evans and a host of other great sideman!). Positively spooky and in the right system, their trombones have an eery tonality. (esp at CES this year thru the BIG Sonus Fabers!).
6. Don't forget the ORG transfers by Bernie Grundman. I've never been a great fan of his earlier work but his latest total retooling of his remastering chain has clearly born fruit. The 45 rpm ORG Impulses are really good though still prefer Steve Hoffman's transfer work as a whole.
7. Be careful with the OJC. They vary widely in sound quality and are about 1/10th of the original sound. The LPs just sound emasculated