It really depends what your "pumping goals" are. With my first daughter, I just pumped irregularly so that I'd have a handful of bottles if she needed it. I think she probably only ever drank about 20 bottles or so all up since it was easier to breastfeed if I was at home anyway. I've used three handpumps - one was a cheap one from Wing On which was pretty useless, then I've also used the Avent Isis and the Medela Harmony. I prefer the Medela than the Isis, simply because sometimes my flow was too great for the Isis and the milk would build up inside and sometimes completely pop the valve out! The Medela's design means that problem doesn't happen. But the Isis was comfortable and effective as well - I think it's just not great for people with fast flow.
I am now exclusively pumping for my second daughter as she cannot breastfeed (cleft palate as well as other medical issues) and I'm using the Medela Pump In Style. I find it great - and I've been using it literally for HOURS each day for going on six months now! When she was first born, I was pumping eight times a day, now I'm down to just 2-3 times, and the pump is great for "heavy duty pumping". However it is quite expensive and in my opinion, if you're not going to be using it a lot, it may not be worth the money.
When I travelled with my first born, I just took the hand pump and it was light and easy to take around. Even with my second daughter, sometimes I've needed to pump out of the house and I preferred to just take the hand pump so I wouldn't be carrying the PIS around. I find the hand pump to be just as effective as the electic but it takes a lot more effort - plus it takes twice as long since the PIS is a double pump (can empty both sides at once).
Anyway - all that to say, if you are just going to be pumping a little to build up some supply in the freezer I'd recommend getting a manual pump - my preference being the Medela Harmony, but if you want to pump at least a couple of times a day, a double electric like the Pump in Style can save you a lot of time and effort.
I bought my PIS on Amazon and had a friend ship it to me, it was cheaper than getting it here.
Another double electric pump that a lot of people like is the Ameda Purely Yours breast pump - although I've heard a lot of people say that it doesn't work for them. I've never tried it though so I can't recommend it.
One tip - don't "over pump" - you can actually build up your supply TOO much which can lead to more engorgement, blocked ducts and mastitis. If you're baby is feeding well, just try to pump just once a day - not after every single feed, unless you want to HAVE to pump every time (which could be a pain if you want to get out of the house!)
I've never really combined pumping/bottle feeding with breastfeeding though - but I have exclusively breastfed with just a few bottles, and I have also exclusively pumped... in some ways, I think that combining bottle feeding (pumped breastmilk) with breastfeeding would be even harder than just one or the other!!
