Barb has some great advice for you. If you end up buying your own, I have loved my Medela Freestyle. It can fit in your hand and is portable, so if you have to walk somewhere while pumping (ie to an unsettled baby, not around the block LOL!), it makes this possible. It also makes expressing away from home easier. It's basically the next level down from hospital grade (although there is a big difference) - it's the top level of "home use" ones.

I hired a Lactina for a month (in retrospect would have gotten the Symphony, even though it's a bit dearer), and then switched to the Freestyle. As Barb said, in those early days you'd be wanting a hospital grade one (Lactina or Symphony).