The 6310i (which is fairly new)

Not really, it has been out for about 18 months and there are rumours that Orange are soon to stop supplying it on their contracts.

I probably need to get a decent car kit soon. I was going to get the one designed for the 6210/6310 etc (because it has existed for years, with regular new phones that fit it). For some reason though, Orange don't seem to have a replacement for the 6310 that fits the same car kit.