A couple things:
Poo doesn't stink at 3 months, it stinks whenever you start feeding solids (usually 6 months).
The stroller is personal preference, but I find more often than not going with the most compact stroller has always been best. We have opted to have two strollers, the one that the car seat fits into, and then when baby is old enough we downgrade to an umbrella stroller. It seems like a waste to buy two strollers but the umbrella one should be a cheapo wal-mart one for 30 bucks or less. We did not regret having an easily transportable stroller for whenever we were travelling and/or fitting stuff into our car.
I agree with the masses in saying change tables don't matter. You will end up using a table, the floor, couch... whatever.
I would tell you to buy everything second hand (used) however this is never going to fly with your wife. If she is anything like any other woman I have ever met your first child will "deserve" new clothes. Then she will come to her senses and use all that stuff for your next child/children anyways. Don't worry if you don't get used stuff for the first one, you will be amazed at how much stuff the kid wares holes in once he/she is crawling.
The wait and see approach is a good one. You need some stuff before baby comes, but you will find that lots of stuff you may never use. Wait until you need it before you buy it for a lot of stuff. We have given away plenty of crap that we never opened, ie. breast pumps, soothers, extra clothes, basinet, countless baby toys... don't buy it until you need it and you will save a fortune.
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