Space Quest, I was more of a Sierra fan in general, but I loved Lucas Arts as well.

Zak is one of my favorite EGA games, and I love how expansive it is. Even though games have gotten more intricate story wise since then, I've never seen another game with such a huge span of locations.
Raj, I loved Overclocked as well. It felt like a page turning book that I couldn't put down.

My only complaint is I wish it could have been longer.