The best label in bootlegs?

Hello everyone,

Naturally, I'm a big Beatles fan.  This was especially true several
years ago when I was colleting some boots (including most of Swingin'
Pigs Ultra Rare Trax series).  Anyways, I've been out of the Beatles
Boot scene for a while and am now looking to add some more to my
collection.  Here's my question:

What's the top label (or labels) in Beatles boots nowadays?  I'm
mostly interested in studio material (rather than live material).  In
particular, especially interested in anything from "Help!" onward.


Are Swingin' Pig and Yellow Dog still around?  Are there any other
labels offering material of similar quality (sonically, speaking)? 
Or, are CDRs the common means of trading?


Thanks for your help.