After owning the N73 for a short period, and after reading stories & reviews, as well as watching clips, for me it's not very cut & dry. A lot of it depends what you're looking for in a device as each one has it's own "specialty" and corresponding price.
If you want to use your N-series to snap still photos, won't need to shoot video, and want a small package, the N73 is the way to go.
The upcoming N75/76 clamshell models are for you if you want a small package and want to carry your music with you everywhere. Neither are the best camera shooters but have decent 2MP lenses.
If you're willing to give up some photo quality for wifi, want some chic slider action, go with the N80.
The N93/i is the choice for videobloggers out there. Great quality, but falls behind the N73 slightly in still image quality.
And of course, there's the N95....please don't make me break this one down.
For me, the N73 is my current brand of Vodka. If it shot 30fps, I wouldn't even think about trading it in. Wi-fi would be nice, but isn't completely necessary. If the N75 had a better camera, I would be all over it. So for now, it looks like the N95 could be looking at as far as ultimate convergence devices (but we all knew that didn't we? ). N93i would be a candidate if I were a TMo customer, but since I'm with the New AT&T, it's a no go.
My biggest curiosity regarding the N95 is it's form factor: one of the reasons I got the N73 in the first place was for the way I can just throw it in my pocket and not feel like I'm lugging around a mini-laptop. From the measurements and what I can see on video, it looks like the N95 is slightly thinner than the N80 but slightly wider/taller which are promising measurements. Handing over $800 will largely fall into how it feels in my pocket - silly to some, but important to me.