We purchased a Safe N Sound Meridian..started rward and then goes fwd. It goes up to 22kg I think??? This was for DS1 and is now being used for DD and she is still rwd facing in it. We certainly have our money worth out if it. The travel system is a great idea..my SIL had one.
I found we had no trouble transferring with the safe n sound one, all kids were used it so they transferred well.
I can also depend on how close you intend on having the kids if you want more..as if you want them close together. Our Safe n Sound has worked for us as by the time the next baby came along the previous one was ready for a bigger seat.