I was able to finally test both the Aguilar AG 700 and the Mesa D 800+ with my Acme Low B2 series III. I was super impressed with both amps. Great sounding amps. Here is my short view of both amps.
Aguilar AG700
I find the Aguilar AG700 to have a great sound, punchy while maintaining clarity. The amp has that nice warmth to the sound that fills perfectly. The bright and deep switches are great; the highs are exceptionally good, not too much sizzle in the sound, however, in my opinion, the deep switch felt like it gets a little bit too thick in the low end, I would never use it. I really love the sound of this amp. There two things that I found to be disappointing are; the fan is very loud and stays on all the time and is missing the Aux-in and a Headphone jack option. I would use this amp for life setting not so much for practice at the house as the fan can be annoying.
Mesa D800+
I just got the Mesa D800 plus. Wow, what an incredible amp, super versatile, punchy, and clean sounding. I am just blown away the sound and versatility of this amp. I can't believe I have neglect to test this amp for years. The bright and deep switches are great; the highs are exceptionally good, incredibly low sizzle sound, the deep switch is outstanding, just enough low end to fill the room and still maintain the punch and clarity. The fan is very quiet. It has the Aux-in and Headphone jack options. This amp is an awesome amp for both life settings and practices at the house.
In all the amps that I have try to match with the Acme Low B2 series III; Markbass Little mark III, TC Electronics Staccato 51, Aguilar AG700, EICH T1000 the Mesa D800 plus took the trophy. I am returning the Aguilar AG700 to the GC tomorrow and the Mesa is a 100% keeper.