I think Reach will be a good close for Bungie, but I think the game itself will be very much to-be-determined in a way. Either it will lose its awesome level by Bungie relying too much on Halo1 as a support foundation or it will be fantastic by it's own originality. If it falls in between like Halo3, timeless, then that would be fine too, but I think multiplayer is going to blow away anything we've seen before.