Benchmarks, how much is really needed?

I'm sorry if the sintaxis is not correct.

This thread is not only about me, but in general I'd like to know for certain types of users.

I have a late 2010 MBA 11'' (1.4ghz C2D, 2GB RAM, SSD)
It scores 2000 in primatelabs.

I only watch 720p movies (1080p would be useless, as MBA 11'' 's display is almost 720p resolution)
Internet, word, excel, and that stuff.

Let's say I get a new MBA 13'' (scores 6000)
Or the MBP Retina (scores 12000)

Would there be any improvement at all? I think that the SSD gives most of the performance. What do you think?

 

Any mac i guess

Thank you for your answer, i think i'll upgrade when i need a bigger screen.
The only thing more would be 720p streaming (mac to appletv) when mountain lion comes out. At some point 1080p, but i'd have to upgrade my LCD. (and use glasses, too)