Buy as little as possible as far as gadgets go. If you ask yourself the question will I use it the answer is no. Your baby doesn't need a bumbo chair, a swing, an excersaucer, an ..., ...., ...., ...., ..... Essentailly all of baby's are us is filled with crap.
If once you have the baby you want something then go out and get it because you have a need for it rather than the other way around.
If you decide to have a second kid you will realize that 90% of the stuff you bought you didn't need and a fast and light mindset is much better than huge amounts of stuff. You will also realize that everything you are worrying about now doesn't matter. So relax and enjoy it.
I will make one recomendation and that is the Ergo Baby Carrier. It is stupidly overpriced
http://www.amazon.ca/Ergobaby-Origin.../dp/B0010XVH08 however for me this effectively replaced a stroller from 0-2. It is better than the other carriers becasue of how much weight it comfortably supports. I used it up to 35lbs. Giving up the stroller was the best thing we did.
Find one on kijiji. But as with other advice wait until you have a real baby to try out with.
Also if your baby spits up don't change your shirt or the babies. Live with it. It saves a so much laundry. Also when your baby is in the crib in the middle of the night and spits up everywhere the other side crib is nice and dry for him to sleep in. You can change sheets in the morning.