1) Nintendo
2) Arcade
3) Super Nintendo

Emulator performance is usually due to the fact they are fan projects that exist on just donations. If GOG were to bring legal emulation of N64/Dreamcast to the PC they would likely have access to the Nintendo/Sega ROM sets not to mention help from those companies in designing the emulator.

- N64
- Amiga
- Neogeo
booo, no psone :(

1! SNES (holy crap there were SOOOO many games for this system, lots of fond memories)
2 C 64 :)
3 N64 GoldenEye anyone :)

in no particular order:
Dreamcast
Arcade
N64

* Japanese/European PC (hey, if you can get some of those to work... Translation'd be a bonus, but I know that ain't cheap)
* Arcade
* PS2

1-Sega Dreamcast
2-Nintendo 64
3-Sega Genesis
Although I seriously doubt emulation to be a part of gog but if they're serious it'll be awesome!

1. Commodore 64
2. Super Nintendo
3. Amiga

- Super Nintendo
- N64
- Sega Genesis

amiga
SNES
nintendo 64

I'd have to go with the ones that are most difficult to emulate:
1) Dreamcast
2) Amiga
3) Arcade (hopefully newer and/or hard-to-emulate games like Sexy Parodius and Gauntlet Legends)
Owning perfectly emulated versions of these games without having to futz around with mounting isos, flipping virtual discs, or messed-up graphics/sound would be well worth my hard-earned dough.

1) C64
2) C64
3) C64
It is without a doubt the avatar of the entire concept of the good old game. It was the first really open and affordable platform for programming (not all of us could spend 2 grand on a 43% PC Compatible word processing machine with a massive 32KB of ram) and was almost singlehandedly responsible for the english gaming industry, the amstrad and speccy were there and put in an effort but the C64 was the unquestioned king.
It provided for an experience vastly removed (and usually a lot better) from the consoles of the era. Some of the games were quirky, unique, complex and replayable. Of course other games were cheap pacman knockoffs, took a while to get rid of those bastards. What nintendo called an RPG was laughed at by the C64 where you had to have a bloody book to encompass the whole story or even better had to have a notebook and write your own quest log.
It also had the finest sound reproduction of the 8bit computer era, did you hear digitised speech in any other platfiorm? To be honest I don't remember but I'd bet the answer is no and it wouldn't have been as good. Would Impossible Mission have been the same without the manic presence of Elvin Atombender saying "Ahh another visitor. Stay a while, stay FOREVER" or the good old "Destroy him, my robots"
Paradroid, Archon, Action Biker, The Bards Tale, Zak McKracken And The Alien Mindbenders, International Karate +, The Last Ninja, Impossible Mission, Epyx Summer/Winter/Whatever Games, Defender Of The Crown, Pirates!, Elite, Wasteland, Times Of Lore, Laser Squad, the Ultimas, the SSI Gold Box D&D games... Basically if it was on the C64 if was the best 8 bit version
Choice 4 (or 2 if you're counting unique choices) is the Amiga because it was home to nearly every awesome pre1996 game that wasn't on the C64
Also, there's absolutely no fucking way you could get nintendo to sign on, the only way you'd see their games on here is if GOG got big enough to buy nintendo (I'm doing my part, thinking of getting panzer general 3d tomorrow)
One really important point, if this happens it has to be in the form of selling collections or extremely cheap games, I really doubt that people would pay much more than 2 bucks for a C64/Amiga game
You got an xbox 360? They recently released an arcade emulation of Magic Sword bundled with Final Fight (and pretty cheap too)

1. Commodore 64
2. Arcade
3. Neo Geo

1. Super Nintendo
2. Sega Megadrive/Genesis
3. Sega Master System (because Alex Kidd!)

Dreamcast
Neo Geo
Arcade.
That's all I care about. I'd LOVE to have a PC release of Seaman or Space Channel 5.