Hands down the best pump that I have used is the Medela Symphony Hospital grade pump.The retail cost was way out of my range $1,500 to be exact. However.
I was able to rent it for $20/wk. I have heard some ladies say that they were able to rent it for $50 a month. So it really depends on the hospital and your area.
Medela Freestyle Breast Pump
A great affordable pump would have to be the Medela Free Style Breast pump. It is alot more affordable than the hospital grade and it is manufactured by the same company. One thing that you want in a breast pump is good suction. The suction is everything because that is going to help increase your milk supply and empty out your breast when it is time. If you have a breast pump that lacks good suction it is no bueno! You can purchase the Free Style on Amazon.
Nature's Bond
One breast pump that I was absolutely disappointed in was the Nature's Bond Double pump. That is due to the fact that the suction power on the machine was very poor. Maybe I was became to fond of the Medela hospital grade.
However, I purchased Nature's Bond because it had some great reviews. But it did not do me too well.