If you're a lost fan, I found lost season 3 on Blu to be incredible. I had watched the show a few times in HD on expressvu, and even that doesn't come close to comparing to the blu-ray discs. Really gave me that "holy this is real" feeling.
I liked Sunshine as well, found the overall quality of both the video and audio was a big jump up from the SD dvd. Also has a DTS MA track
So if you're a sci-fi fan check that one out.