i didnt read the other responses to this but this is my advice:
get the rock n play
we got the fisher price rainforest bouncer, the snugglebunny swing, and the rock n play.
my lo never used the bouncer seat. she hated it.
the swing was a lifesaver.
the rock n play was amazing, because i could carry it from room to room and my lo was very comfy in it, they can watch you, you can rock them, and they can also sleep in it. definitely, definitely, worth the money!
do you NEED it? you can survive without it. is it worth it? yes. so if you have the extra cash, i say go for it, and skip the bouncy.
if you have to pick ONE, and can afford the swing, thats hands down my choice. it SERIOUSLY rescued me 10000 times the first few weeks.