Almost all brands in the market are OK. The companies making them have after all studied the market well and won’t like to lose a huge chunk of the market by designing the mixie to suit only a particular segment of the population.
Go for a heavy duty type (with powerful motor) so that you can grind the idli, vada and dosa batter and make chutneys, dry powders etc. Go for the model that comes with 3 or more jars (2 is of course absolute minimum but 3 would be better). That way, cleaning won’t be needed too often and that can be postponed till the completion of cooking.