Glad to see more Kaufman fans on here!
I agree with Synecdoche, NY being a masterpiece. But I needed a second watch to even begin to fathom its depth. There is also a great series by Yourmoviesucks on Youtube on it. It's a shame it failed commercially.
Eternal Sunshine of the Spotless Mind is almost on par with Snecdoche in my opinion. A well deserved Oscar for sure. These two are definitely in my top 5 of favourite movies so far.
Malkovich and Adaption are also pretty great in my opinion, with Human Nature a bit behind.
And I blame Clooney for Confessions of a Dangerous Mind.