
Naturally, the search for a good 5in composite LCD begins and I just got this LCD in the mail today. I tested if it will work with 5v out of the box and I'm pleasantly surprised that it works without any mods! This LCD allows switching between 16:9 and 4:3 aspect ratios.
Here are pictures of the display running ES with my GB Pi2 alongside for comparison:
[spoiler="Running on 5v without any mod"]

[spoiler="EmulationStation"]

Note: The spoiler tag gets broken when a colon (:) sign is used. I used 16-9 for 16:9 and 4-3 for 4:3 instead.
[spoiler="Mario Kart in 16-9 aspect ratio"]

[spoiler="Mario Kart in 4-3 aspect ratio"]

For those interested, here's the Amazon product page. I got the screen from seller EPCDirect.