FWIW our little one came a couple days earlier then I expected. I intended to pick up an 85/1.8, but wasn't able to pick one up in time.
So, I shot with my 50/1.8 on both my crop body and an old film camera. It delivered exactly what I was looking for (well, I don't quite yet know with the film camera, haven't developed the film yet!). 85mm would most certainly have been too tight for the situations I was in, and 35/28 would have been good, but I think the 50 was the perfect balance for what I was interested in.
Thanks to all for the advice! For now I'm a little busy, but I think I'll still pick up the 85/1.8 eventually, the thinner DOF over the 50/1.8 really appeals to me!