Hi and welcome
I don't know about the other questions, but can answer the one about having the baby. My little boy is now 3, and we've had the car two years.
I really, really don't want to put you off buying a 159, b/c it's truly one of the best cars I've ever had - but, you really must get your wife on board and wanting the car before you buy, b/c I do put up with some day to day inconveniences, just b/c I love the car, e.g. the boot is not big - I had a medium sized pram from Mamas & Papas, and it *just* fit sideways when collapsed, but only a certain way
. I'd definitely recommend you try it before committing to buy. Also, the rear seats are not very roomy, which makes for a little contortion work needed when fitting car seats/getting baby in and out. Having said that, my son's car seat is now fitted in the front seat next to me (passenger airbag switches off easily), as it's usually just me and him, so we are fine.
I hope I haven't put you off, b/c, like I said, the 159 is a fantastic car, just please make sure it's big enough for your needs, and make sure your wife is on board with the idea, or you will hear a lot of complaining