I haven't read the PP responses, so this may be duplicating some great advice I am sure you've already received.
I have an Avent pump and Avent bottles from when I BF and pumped for the first 12 mos for my little one. And I plan on using them for Baby #2 (after I conceive)
Here's a quick rundown of why I like(d) them.
Avent let's you pump directly into the bottle.Storage caps/discs, so you can just screw on the nipple.Everything is interchangeable.They are the safe plastic of course.They stood up to sterilization and dishwasher cycles.They come in a variety of sizes (4, 6, 8, 9 and 11 oz)Marked in metric and us measurements.
I gave my bottles away to a co-worker who was fostering a baby,she kept the baby for 1 week and still has my bottles! So I'll be using all new bottles. Not that I'd want the bottles back, but I gave her a bathtub, clothes, toys, etc thinking she would have the baby for a couple of months. But I digress...
Obviously I'm not a BTDT mom, but I did some research for when we registered.