First of all. N9 is a great device for the price even if it's not close to the awesomeness of the n900. I think you shall take a look at Samsung galaxy note. I think that is the way the N9 and possibly a future N10 should have moved towards. Another phone you should look at is the new 808 Pureview. If you can live with Symbian and with the last of its kind(possibly) you get an excellent device. if you don't need a new phone now, you could wait for the first Tizen device. But there is alot of uncertainty about that atm. You have to do a trade off since all phones have good or bad. Add points to your list in of what you prioritize most and it's easier to help you.

My chose for you is the galaxy note if you want the overall super device. But since you are here and lived with the n900 a while a cheap n9 could be the way to go until tizen or some other cool device appears.