If you are into tuning, I would suggest to go for option 3. There are many many upgrade kits in USA for the IS300. From what I know there aren very few upgrades for the IS250 and especially for the IS220. If you go for the first option I would suggest to go for the auto option. I have driven many times my father's IS250, which is manual and it is not so pleasant as the auto. Also it has a heavy flywhell which means that when you start from stop most of the times it doesn's start smoothly, what the IS200 does also as you know vey well. With the auto you will not have this problems and it has a very swift 6 speed gearbox!!! Also IS250 and especially the luxury edition has a lot of gadgets, such as the heating-cooling seats, the nav, the touch screen, the mark-levinson audio, bluetooth, and many many other things.