Buying a used car in Rustavi (Tbilisi)

Hello :) We have just moved here and have started looking around for a car. We had our first trip to Rustavi today just to get a feel of the place and the cars. I think what we will do going forward is call more people before we leave and try to set up appointments then make our way down. Does anyone have details of a trustworthy mechanic who will give us an honest review of the car we intend to buy? Also any other recommendations about reliable sellers etc. are very welcome. Many thanks!