One of the biggest questions we get asked is what pump to buy.
The right pump really depends on how much pumping you'll need to do. BUT...no cheap pumps. Which eliminates certain brands right off the top.
Here then, are the tried and true pumps.
MEDIUM TO HEAVY NEEDS:
As in, working full time or pumping exclusively.
Medela Pump In Style: Approximately $300 at most stores. A double electric that will get the job done quickly. Removed from recommendations because of problems with black mold and non-compliance with WHO code.
Ameda Purely Yours: Another excellent double electric.
EDITED TO ADD: Hygeia. Closed-system pump that seems to work quite well.
LIGHT TO MEDIUM NEEDS:
As in, part time work or SAHM needing only the occasional bottle.
Avent Isis: An excellent hand pump. For some moms it works better without the petals.
Medela Swing: Single electric.
BRANDS TO STAY AWAY FROM:
Evenflo. AKA Evilflo AKA The Nipple Shredder. A *few* moms have been successful with this one, but many find that they can't get anything. Or worse...it breaks.
Gerber: Also a breakage record.
EDITED FOR UPDATE: First Years (miPump): A track record of poor performance and early breakage.
EDITED TO ADD: There are always exceptions and your mileage may vary. Some moms can't get a thing with a Medela and excel with the Evenflo. The above recommendations are based on years of feedback from moms.