I had my first almost four years ago. We started with the First Years pump that Wal-Mart carried. It was an emergency purchase and a POS. I do not recommend.
My husband then ordered the Medela Pump In Style for me to use when I returned to work. It was awesome and the design makes it easily portable and discreet. Highly recommend!
Then, because I was pumping a lot, my husband also got me the Lansinoh pump. It was not as portable, but it was a good, strong pump and less than half the price of the Medela. I would recommend it if you are on a budget and don't plan on traveling with the pump as much.
This is based on what was on the market four years ago. I now have 9 month old twins. I have tried using the Lansinoh, but it doesn't seem to have weathered being in storage for three years as well as the Medela, which is working as well as the day we bought it.
Good luck and best wishes.