I used to play this game in my head on the way back and forth to work (out of commuting boredom.) Then I crashed the car and got to do it for real... I don't play it much anymore
(Had more to do with getting the seats I wanted, vs. what I had bought before I had known better, lol.) So I have to think about it...
Let's see, just with what's in my car at the moment, I have an XTSL, a MyRide, a SK Monterey, a RA50 and a ProSport. Oh, there's an extra Turbo in there and a Literider, too.
I would probably end up with another XTSL and MyRide, simply because they're what fits back there, and I need the height of the XTSL, and another Monterey as well, although I would really really hope I could find one with the old belt guides. I might consider something else that fits in that spot and gives good sleeping support, but I don't know what would would.
I'd really like a Graco Size4Me, probably in place of the ProSport, pending seeing it. And then I don't know what in place of the RA50, I could do the S4M there instead if it fit front-to-back. Maybe another MyRide. I
my Graco seats. I think it would largely depend on whether the 4yo I have this summer wants to RF or FF; if he wants to FF I'd get a combo, maybe a Maestro?
I probably wouldn't replace the Turbo, and I have a couple of backlesses hanging around that I'd throw in for the backup use the LiteRider serves.
Yeah, I'm pretty boring! Not many changes, aside from the S4M, which I am seriously consideing getting (without having to crash! lol) if the 4yo wants to RF.
ETA: Wait, all of my seats, including those in storage? I don't think I'd replace them all, I'll steal Judi's answer and add it to the trip fund. I also have a F80, Maestro, Scenera, three Literiders and a Cosco highrise. Oh and another Turbo. I think that's it, other than expired demo seats. I can't seem to keep track