Looking for a DIY headphone amplifier kit.

I am looking to buy a DIY solid state/tube headphone amplifier kit, here are my requirements:

(1) The kit should come with a case/enclosure.
(2) MAX budget is $120 CDN.
(3) Everything should be included in the kit, I don't want to buy different components separately.
(4) I want it to be as powerful as the O2 or even better.

I have already considered this , this and this so far.

Please recommend more!!