If you have health insurance, call them and ask what breast pumps are covered. It's new, but they are required by law to provide pumps. Some insurances only do a manual, but most will pay the 329 for the Medela Pump in Style.
Beware that the PIS is loud, as are most electric pumps. For 4-6 hours away from baby you may only need to pump 1-3 times. Take that into consideration with price. Baby will need 1oz for every hour you are away. It will be very easy for you to get that available for baby the first time you go back and then each time after you can use the milk pumped from the previous day for husband's feedings.
Different pumps work different for everyone. It's up to you what you choose. There are awesome reviews and horrid reviews on every pump out there. Pick a price point and go from there.
at 3:20 PM on Apr. 2, 2013