Hi! My 2c:

CZ 16-80 has been my favorite lens. Something about the photos it takes, just makes everything POP! Good contrast, colours, sharpness, resolution. 16mm also creates interesting photos. Very fast focusing. Sometimes on ebay, but not too often. I did try 24 and 28mm primes, but found I needed to stop down to get really sharp, by which time the CZ was just as sharp, even when it was wide open. So I sold the primes...

If you want the longer range the 70-210 f4 takes fantastic photos; very affordable, but it is heavy. Very common on ebay.

18-250 seems to get good reviews, but I've never used it. personally I'd prefer IQ over most other things.

Good luck!