I am currently just using the Mesa on it's own. MK IIA head -> JBL K-12 2x12. It sounds great but needs a bit of work so when I save up a bit of cash (and I am almost there) it will be heading out to Shakedown Amps for a cleanup and extra Jerryfication. I plan on getting of Mcintosh MCx at some point. When I have the cash to spare and I find one that I like i will snatch it up. an MC50 would be more than fine, but I do love those blue VU meters so getting an MC2105 would be a real treat (an MC2300 would be tops, of course, but for my purposes it is most certainly overkill. They are so damn nice, though.)
Anyway, I know a lot of people content that Garcia was using the clean (Rhythm) channel and not the Lead channel - you vsn switch between the two but when you do the amp has to be completely dialed in again. What sounds good on the clean cvhanel is a mess on the lead channel, and vice-versa. But I have discovered that if you engage the lead channel but keep it low (around 3 or 4), keep the lead master on 1, set Master 1 at 2 and then drive you overall volume level with Volume 1 you keep the signal very clean but with just a hint of bite. With the amp at these settings, when you crank up your guitar's volume or strengthen your pick atack you get a bit more grit, but it stays in the clean realm, getting you right into that clean/dirty Garcia tone zone. Even without a McInotsh in my rig, with those setting the tone gets damn close to what you hear on the February 1980 JGB tour.
Lots of good info here
I don't have any experience with the Deluxe Reverb so I can not comment on that. The consensus around here is that it is a good amp but not so much of a "Jerry" amp. If you go with a Boogie I think you will be pleased - they offer so much flexibility. There is a world of tones contained within those amp. There are rather large differences between them, especially in the Mark Series - The MK I, MK ii, IIA, IIB, IIC, IIC+, III (with green, purple, blue and some other color stripe and no stripe models), MK VI, MK V - plus the LoneStar's, the Rectifier series and so much more. Do your homework before pulling the trigger on a Boogie. They are great amps and they don't seem to be in the "one-trick pony" category. But if you want a Jerry amp, for example, you may not want to get a MK IIC+ (aka the Metallica amp). Check The Boogie board forum. Tons of great info over there.