Congrats on the lovely news!! Is it your 1st? Whats the Due Date??
My son will be 9mths old end of this month, so we've not long bought his first forward facing seat.
Are you looking to get a fixed seat for the car, or will you be getting a travel system (pram/buggy with car seat)? There are tons of options out there. Personally if I had another I would go for a fixed seat. The travel system was great when he was very small for just clipping onto the pram/taking into the house etc. But after a while we got P'd off with strapping the thing in all the time, was well fiddly. And it didnt take long before our boy was too heavy to carry in it, then he got too long. If you leave them in the car, the way they strap in makes it really awkward to put baby in. Some of the ones that fix in your car clip off the base, so they can still be removed, and you can also get some of this type on the travel systems. So thats a few things to consider.
There are also the Stage 0+1 seats out there which are rear and forward facing. We have one and they are good for the job, but I much prefer the forward facing only one that i've got now. Hubby has been landed with the other one for his car lol, much to his disgust.
Okay, more to the point of your question. Lots of seats out there say in the description that the base fits better on contoured/sports seats, so they would probably be worth looking at. You can also buy mats now too that you put on your seat under the baby seat, and they are supposed to make them fit better. Try the online stores like kiddicare.com. Also, best to find one you like in the stores, and most Halfords stores will bring it out and put it in your car for you to try out (Mothercare are supposed to do this too but I hear they arent good at the service). Then go on-line and
shop around, almost guaranteed you'll get it cheaper.
Right i've rambled enough, can you tell im a 1st time mum who likes to be clued up? lol.
But I will say to anyone thinking of buying a forward facing car seat, the BebeConfort Axiss (the ones that swivel to face you for putting baby in/taking out) are fantastic and a god send, especially if you have a little monster like mine, a bit pricey but if you have the cash definately worth it. The cheaper version that doesnt swivel, BebeConfort Iseos TT are also great too and we were going for one of them. The Oxygen Black and Oxygen Red (which we have) colours are fab, and the seat looks really nice in the car too, quite sporty.
Give me a shout if I can offer any more advice. No doubt i'll have already found what you're looking for pmsl. Best of luck!