A second-gen Atari Lynx unit with an updated BennVenn LCD screen.
I've been a Lynx junkie ever since I was a teenager when they first came out. If you've ever used one you know the screen, while revolutionary at the time, is their biggest weak spot due to dimness, streaking, etc, but these new super-bright LCD replacements are the bomb.
Also recently discovered that flash cards with MicroSD slots exist for them, so now I just use 1 cart with all the roms ever made downloaded on to it, much more portable. Still one of the best handhelds after all these years IMHO! (PSP/VITA probably THE best)