Hi,
I am probably a bit too early to be thinking about this too (10weeks) but have started riffling through DS's stuff already to see what is recyclable.
I would really recommend a changing table, we got one 3 months in and it made life so much more comfortable. I have one which is corner shaped, so you get to change the baby while it is lying with its feet towards you - i dont like the ones you get in restaurants that have the baby lying sideways, I find that really akward. We also had for DS some shelving units to store the nappies, wipes, bum cream etc. Its really handy to have somewhere totally out of their reach as when they get bigger they want to play with the wipes, cream, etc.
Blackout curtains are an absolutely essential. You will desperate to do everything you can that will help them sleep! I got thermal ones which also keep the room warm in winter and cool in summer. He has some pretty curtains with teddies on which go over the top. (DS's sleeping DID improve a lot when we got them, naps especially)
We have a wardrobe too, which I would recommend. Clothes on hangers high up are much harder for toddlers to grab and throw around than stuff in drawers - obviously this is a long term consideration but I doubt you want to buy new stuff in 2 years.
muslins are great - works as burp clothes, thin summer sheets, protective layer for when you are using change mat in restaurants, swaddling blanket, breast feeding cover, feeding bibs etc etc
Also we installed a dimmer switch in his room - very handy. Cant tell you how many times I bumped into the effing rocking chair in the dark before that.
I will NOT be using the rocking chair again (see above) budget permitting I want to get one of those lovely comfy soft, rocking SOFA chairs.
thats all I can think of for now.
best wishes xx