What no Vectrex? Still works and though I've lost the screen deal the games are still good!
I have never played one, it looks really cool though. I think vector based games were totally solid. I am going to look for an emulator this week and check it out. There are ways to USB a trackball or dial controller to a PC. Some people have also built MAME cabinets with built-in control hardware for many different styles of games. If you knew how you could wire a button config into a single board with a stick, a roller, and a dial. Ebay might have options.
Snake Eater was cool - my fave of the MGS series. Another fun one on PS2 I just remembered was Burnout: Takedown - what a fun game. And of course Deus Ex. (I guess the PC version was supposedly better but I loved the console version/controls.)
Snake Eater is also my favorite game of the series. I haven't played any MGS games beyond PS2 or PSP and with PSP it was online mode almost exclusively collecting unique soldiers and weapons. MGS3 was so good, I think it is my favorite game of all time. I liked the story and gameplay, but also the easter eggs and all the little hidden things throughout. The whole concept was great.
i play a lot of the old games on a DSlite using an Acekard 2 loaded with emulators. i've been playing movies on that same hand held. they play really well and the sound is amazing when using ear buds. nice way to kill time at an airport. 
Do you need to hack the DS in order to play common media formats? Can you quickly plug in and drop roms or files into a folder really quick using USB? My PSPs are factory firmware 6.35 to 6.37 and I am able to run so much on them without any modding; swf, mp4, mp3, m4a, wma, pdf, txt, html, php, css, javascript, many retail eboots, countless emulation.. and tons of homebrew like ms word clone, code writers, ftp client, torrent downloader, youtube loader, a paint clone, a simplified google earth clone, a star mapper, a file manager/explorer, converters and calculators, internet radio, and live audio streams through RSS. I've gotten on trains for 3-4 days with 4-5 extended life batteries and 59-60 gigs of data in the PSP. It was prepared for Armageddon.
I recently added about 25 games to my PSP collection. I grabbed a bunch for .74 - $1.49 each when an EB near me decided it was time to unload their PSP inventory and reduce all their games to no more than $4.99 then reduced them all again 85% more. Several were only a quarter, like 25 cents with booket/manual, case, and unmolested UMD. It was insane, only 2-3 of them were sports games, but the rest were real games that used to retail for a premium price tag. Now I have a couple of dozen unplayed games on top of a few dozen already unplayed games as well as a handful of games I am not even finished playing since this PSP thing began on a whim after missing a bus on my way to work one day in 2007. There is just no frigging time. I am invested in PSP until the year 2037. I always comb through racks and find awesome shit when it's the right price. I still have a few I'm trying to track down.