Welcome to BB, it's a great place to get hints, help and advice.

Do you have your baby yet? I ask as it will help to know what your flow is like for expressing.
I found the best one was the Avent manual pump. I am going against the grain here, I just found I didn't need the electric.
If you have friends who have breast pumps, ask them to have a go of theirs first and see what works best.