We have isofix in our VW & for our latest arrival we went for Cosato Giggle, it's really light, easy to fold, feels well made and the whole lot is around £300, carseat clips in so they so they dont wake up getting in & out of car (Godsend) and the pram bit is light too so you can take that bit anywhere, converts to a forward/rearward pushchair later:
God, how domesticated am I?! Get the bubble bath & candles out.
I like fires too.
edit:
Congrats also!