Here are some previous threads with breast pump recommendations:
http://www.projectwedding.com/post/list/buying-b-pump-suggestions
http://www.projectwedding.com/post/list/breast-pump-recs
http://www.projectwedding.com/post/list/hands-free-vs-pump-in-style
I used a Medela Pump In Style for the 14 months I pumped. If you're going back to work, then a double electric pump is highly recommended. It'll be faster and more efficient than a manual pump. If you will be a SAHM, then a single electric or a
manual pump will probably be all you'll need... assuming you need a pump at all.
Another option to consider, depending on whether you'll be a working mom or a SAHM, is renting a hospital-grade pump. They are usually rented on a month-to-month basis and will be the highest quality you can get. And sometimes insurance will
cover the hospital rental fee. After a month or two, if you decide that you'll need a pump long-term, then you can buy whatever pump you desire.
If I have to buy another pump for baby #2 (and I hope I don't have to), I'll look at getting an Ameda Purely Yours. It's supposedly just as great as the Medela pump, and a closed system (the motor is completely sealed off). And a little less
expensive too.
Based on my experience and from the reviews of other pumping mamas, spending the $$ on a good, quality pump is worth it in the long run.