Justifying a Nexus 7

Don't get me wrong. I want a Nexus 7--I really do.

Here's my problem:

I own a Nexus S. I've owned it for years and am running it on the latest stable release of CM10. The experience isn't bad, but it constantly stutters (especially with the notifications center) and makes me want a better experience to use. Android is beautiful otherwise.

But how can I justify $200 on buying a Nexus 7 when I already have a current Android experience as is? $200 surely isn't enough to deserve slightly better performance.