The only reason I like the Rocker is that it's Mille & Boris and therefore matches everything else! Tis very expensive though for what it is as you say 
If you HAD to choose one, which would it be?
The Swing is currently cheaper than the Rocker anyway so we could order that one and take advantage of the better price. The only thing is that I like the idea of it all happening automatically in the swing but it seems quite bulky for a newborn...? And it's not the smallest of things in the flesh!?
The Bouncer is the cheapest and also vibrates and bounces and plays music which is nice too
The Rocker has no music or vibrate function
The Swing does everything but is bulky and will take up more room...
?!
ETA - Thats a good point Cedar, we do want to get something upfront but it might be best to get the bouncer intially as it's the cheapest and still quite good functionality, and then we can invest in a swing down the line if we think it'll be a good investment maybe?