What should we look before buying a laptop?

[Michael Paul Zamot]

Hello, my name is Michael Paul Zamot, I'm from Costa Rica.
I'm using OpenBSD since two months ago and I'm in love with it.
I'm planning buying a laptop, perhaps a screen of 11" or 12" inches.

I would like to know if you know about a compatible model, under $400.
What should I look before buying one? Any recommendations?

With recent addition of AMD KMS and Intel KMS I don't think video would 
be an issue.

Thanks!