i kno its a hard job to decide.
Well a lotta ppl like the k800 ovr the n73 caz it has a better flash light (xenon), it luks cooler n has a cybershot camera. The camera in the n73 is better to take day time pics but when it cums to night time k800 is better.
Most important is dat n73 is Symbian n k800 is java.
So u can mess around with the n73, like put divx codecs n save space or use da phone as a remote control n a lot more appz for customizing da phone which u cant do in a java phone.
But if ur goin for da n73 go for the music edition which is overall da best.
