Waveform

Im going to buy mpc 100, but first i have one question - can i see waveform while chopping samples?

Yes. Check out the Official manual, gives you an idea what you'll get. Once you're familiar with your machine install JJOS (start with free and once you start needing more stuff get the latest).

Edit: Manual PDF - http://www.mpc-forums.com/files/MPC1000/mpc1000_manual_v2.pdf