This is a little bit of an old thread, so sorry if this is late.
I've heard people say things like...if you like the Mini-Me then you'll like the Mini-MP because they sound alike. Same with the SD products. My opinion is that's just not true. To my ears, the 702 and MP-2 don't sound alike. The MP-2 is far looser on the low end, which is the feature that ended up causing me to conclude that the MP-2 was not for me. The 702 is nice and tight...very crisp sound with excellent detail...MP-2 not nearly as good detail but a pleasant overall sound in a very well designed package. I've read opinions that the MixPre tightened up the low end a bit, but can't confirm.
Again, my opinion, but I'd pick an Aerco hands down over an MP-2 based on sound....but again my experience is with the MP-2 and not a mixpre.