Depending on your kid, you may or may not ever make it to a bottle that big. My son never in his life ate more than about 4 oz at a sitting.
One option is to pump directly into a freezer bag (you can do that, esp. with the Madela bags, which have a strap that goes over the pump horn) and then use the bag as a drop-in insert for a bottle.
They also sell adapters so that narrower bottles can be screwed onto larger pumps and vice versa (ie you could use an adapter and pump into a larger Avent bottle if you wanted). Honestly, if you're going to be storing any amount of milk for any amount of time, you'll probably want to use freezer bags for 2 reasons. First, they take up a lot less space. Second, they're a lot cheaper than bottles, and if you're anything like me, you'll have over 2 gallons of boobsicles in your freezer - and that's a LOT of bottles you'd need to buy. Lots more than you actually need for feeding.
On a related note, I would NOT recommend pumping AT ALL for the first 3-4 weeks after the baby is born. Just nurse him a lot, get the breastfeeding down pat, get your milk supply established. I think there's a potential for people to run to the pump when they're having trouble breastfeeding (either because their nipples are sore, latching problems, etc) and if you start bottle feeding your baby too early he WILL get lazy and decide that it's easier than breastfeeding. Plus, then parents start to get used to bottle feeding their baby and start worrying about stupid things like "how do I know if he's eating enough?". Hopefully, they told you in your class that you should keep feeding your baby until he decides that he's had enough - and that means nursing one the left side, the right side, and if he wants to go back for seconds, back to the left side, etc - until he's full. What you should NOT do is offer him a "chaser" bottle after he's nursed. Your milk supply will never adapt and increase to meet his needs if he's not nursing exclusively.
Don't worry about having enough milk stored for when you go back to work. Once your baby is 5-6 weeks old you can start pumping on one side while you feed him on the other side (you'll get the most milk in the mornings) and if you get just 2-3 oz every day this way you'll have plenty in reserve by the time you go back.
PS: (commented added 3/25/07) I do not consider myself to be "The Breast Feeding Police". All I posted is what worked for me and the people that I know who had good success breastfeeding, versus the people I know who had problems with it (which was many). Of course there's nothing wrong with pumping full time if that's what makes you happy, but lots of moms have difficulty keeping their supplies up while exclusively pumping. Not to mention, breastfeeding is much easier and pleasant than messing with a pump - you get to be close to your baby, you don't have anything to prepare or clean up, and the baby always get exactly what she needs.