See my post about the cost of a 40k service in the same forum. This highlights my costs for the 10k, 20k and 30k services. Otherwise the only costs to date have been two new tyres (one puncture, the other due to poor tracking after the first tyre!) and a wiper blade. Went thru first MOT no trouble.
40k service is a lot more expensive and likely to need brake pads at £xxcessive (unknown yet)
At 3 years old thought about new DVD for Sat Nav but at more than £300 bought a cheap map instead. If you buy from a dealer try insisting on a new dvd.
Fault free so far and a still enjoyable to drive. Still feels like a new car to me. I would have thought that after an IS200 you will find it a very different driving experience but as long as you accept the additional space, height and weight will have an effect you shoukld still enjoy it. The view from on high is good but its not so high you have to climb in (like a Discovery and the like).
I would thoroughly recommend an RX