Also for sampling, take a turntable which is robust and doesnt skip each second when looking for samples. Stopping and starting the record with your hand is something you will do a lot. So make sure you dont go too cheap n plastic.
Each turntable has their advantage. For example if you get a belt driven tt, you will have some difficulties starting and stopping the record flawless. On the other hand, with a belt driven tt, you can start and sample the record from very slow into faster speed. If you open up a Technics SL1200, you can manipulate these settings. Other brands/models have these options on top of the unit. Some dont. I think overall, a second handed SL1200 will be your best bet. They last long and they are VERY comfortable. .. and pretty!
These models are on the market for more than 20 years for a reason.. Technics didnt change them one bit over all these years. Although I have to admit, a turntable with a lot of bells and whistles (effects, reverse, larger pitch range, etc..) will give you more sampling fun. But remember, the more options you have, the sooner one option will break. Numark is a perfect example of malfunctioning turntables and mixers...