Hey CFG- ASAT,
I’ll take a stab at it, with a little Bluesboy experience.
The Bluesboy 90, I have a Detroit Muscle Series: SS Collection - The P90 is more rock oriented versus the standard IMHO. You can run in neck only for some gritty rock, middle rounds it some but still rich sound, and time tested MFD bridge.
Special build ASAT Classic ‘blues boy’ Mahogany - This has a certain magic. Not a super heavy mahogany but dense enough to give that rich tone and the neck feels excellent. These pickups match well with the wood, as you can see described on Jos' page.
Jos has a great write up on the history of this special build, see below. Even if he thinks the pickups could be better balanced it’s a great sounding guitar.
http://www.yowhatsshakin.com/yowhatssha ... ogany.html
The Roses ASAT Classic Bluesboy - One of the 20 Roses versions. Jos has a great history on the Johnny Garcia custom engraved guitars and his version of The Wrangler.
http://www.yowhatsshakin.com/yowhatssha ... ngler.html It has a beautiful voice and the #1 neck is fantastic. The Seth lover neck pup has just enough warmth and enough gain to cover a lot of ground. This may be more what you are comparing with. All around great guitar.
Last option is a ASAT project I put together with a BIG MFD bridge and a Paul Gagon G&L neck humbucker. Had Chandler do a custom guard and this little sucker is sweet! More meat in the bridge than regular small MFD (good ol' ASAT tone), middle position is killer and rolling tone knob or volume knob gets wide range of tone, and lastly the Gagon neck pup has its own sound.
Didn’t do anything other than stir the GAS,
but like Craig said get your hands on as many as possible and even see what videos you can find. Keep your eyes open on Reverb, fleabay, GearPage etc. cause ya never know what will pop up.