We're moving, buying a car for the first time since having kids, and thus need to get carseats for DD1 (25 months) and DD2 (3 months). I'm looking for advice on what seats will fit in the back of a smallish SUV with room for an adult passenger if necessary. I think both seats will need to be rear facing to start with.

I'm currently considering Britax Marathons (they seem to be what everyone I know has), Maxi Cosi Prias (we have a Mico infant capsule and love it), or possibly a cheaper model like the Safety 1st Guide 65, although I'm wondering if that one is as "good" as the others. The Safety 1st model seems to be the smallest, which is good in my case. My girls are petite, so I'm not as concerned with very high weigh/height limits.

Thanks in advance for any help - I'm ordering from overseas so it's hard to take my kids into a store to try out seats, since where we live most seats sold are UK models.