I like the old 2005 version. It gives me a feeling that I'm home. It's not that I don't like the new version, but it's just that I'm used to the older because of GT4.
I don't like the first section in the new one, it feels too wide and the lack of visual refference from the grass area blinds the forst two corners. Not only that, but it feels dull, just like in the case of Fuji where the older ones were much more fun. Since I use strictly cockpit view, driving cars like the 908 HDi FAP in the new one, you have to virtually guess where you are. It's a lot of fun though.
For the classic feel I would definitely suggest "2005 no chicane" all the way!!