I agree, it's got all the improvements that have been made since your version and is only $50.
I bought it even though I have the full lifetime version of Platinum. I like it a lot and use it for MIDI only projects on a laptop I bring to work and travel with. It's rock solid and I bought a few 3rd party synths and drums from Air cheap so it's got as about as much VST horsepower as Plat now for about $100 extra.
Look at the comparison list and decide which features are important to you, Maybe for $100 Artist will suit you better etc.
http://www.cakewalk.com/Products/SONAR/Versions#start Sadly I don't think they have made many improvements to the notation end of things. I have never used this feature myself and I think this is true of most DAW users. So notation takes back burner to the list of improvements requested by users.