the last one you linked goes up to 11 years so you wouldnt have to buy another.
not sure what the difference is between the one i labelled fancier and the 1st one you linked, apart from the bottom of it and the price. ??
i think rear facing ones become a bit defunct (not right but cant think of the word) at about 9mths. child will become very bored if they only have a seat to look at imo.
i think that the majority of ladies on here have quite a high disposable income, judging by how many comments like 'hire a nanny, cleaner, gardener, pay for this that and the other' gets banded about on other threads as advice.
im afraid we dont have a high disposable income and also my roots are firmly working class. which makes me
at some of the prices of things people will pay. i cant help it. 
waves to buffy sorry was meant to wave about 10 posts ago, but forgot.