Agreed. Most of the older turbo'd cars are sluggish off boost....
My advice would be to buy one with a FSH inc the FULL cambelt service. Obvious checks aside...... Check for smoke from the rocker covers. Listen for knocking at slow speeds over bumps. Check for a lumpy idle. Look in the history for evidence of regular oil changes (every 5k). Remember that regardless of mileage the cambelt and all associated parts need to be done every 5 years max due to belt degrading/weathering. Try your best to find a facelift one! Oh, and ref the quattro system listen for whining from the diff on the testdrive and a banging sound under hard changes/acceleration. Those are the main points in my experience, but hey every car is different and comes with its own unique lottery ticket!