If you're willing to skip the Aeros requirement, but insist on Mogas, then you may well find that the best solution is something that has a Rotax 912 or one of its variants (912S, 912iS, 914). There's a whole series of VLAs and experimentals on the market today, both new and used, for any budget.
Here's a few to get you started:
Aero AT3
Aquila A210
Europa (monowheel or trigear - for a low-hours pilot the trigear is perhaps the better choice)
Evektor Sportstar
See
Rotax 912 - Wikipedia, the free encyclopedia for a far more comprehensive list.
As far as the Mogas STC for the R2160 is concerned: A year or two ago EASA issued a document that lists the engine types that can be run on Mogas as far as they are concerned. I haven't checked the details, but
AFAIK aircraft with these engines don't need a further aircraft-specific STC to run on Mogas - provided certain conditions are met. You need to do a bit more investigation but it might well be that the R2160 can run on Mogas without a specific STC to do so.
Here's a document to get you started but I don't think it was the final version or form:
http://easa.europa.eu/system/files/d...08-6-light.pdf