Firstly. Wrong thread.
Secondly. What are you on about?

1.) Super Nintendo- This has so many classic 16 bit rpgs it would be crime to not bring them back.
2.)Dreamcast
1.)Nintendo 64

Ooh, great idea!!
I definitely second this, on the same grounds I voted for Dreamcast emulation.

1. Amiga
2. C64
3. Arcade

1.Arcade
2.Dreamcast
3.N64

1. Dreamcast
2. Sega Genesis
3. Nintendo 64
I'm rather surprised to see so many votes for the 64 and Amiga. I still own both systems (in my garage), and they're fun to fire up now and then, but I can't imagine really sitting down and playing through many of the games for any period of time. Nostalgia is great, but I can say from experience that the charm wears off quickly. Personal opinion, of course.

While my favorite console is snes, my answer to this question is ps1.
Simply for the fact that, while I can easily download snes/nes emulators, whenever I try to get a ps1 emulator running, I always have to worry about what kind of malware will be in the ps1 bios.
So, for us all to get the best bang for our bucks, and for gog to spend its time/money most wisely, I'd say ps1 and any other system where there is currently no legal and/or open source way to run an emulator.
That would be something even a pirate like me would pay for, and I imagine others would as well. A known good emulator and a copy of ff tactics sounds pretty good right now.

1. dreamcast
2. nitendo 64
3. super nes
I know... its easy to found emulator .. but its better when its legal and if i can play shenmue an sky of arcadia on my pc i was very happy...
(sorry poor english)

Personally, I would like to see GOG remain exclusively a PC only digital distribution service. However, I realize that it might be in their good interest to venture into other past platforms if it means it will help them to remain in business. With that being said, I would like to see games from the following platforms:
1. Sega Dreamcast
2. Arcade
3. Sega Genesis

For my list, from the options given, I'd say:
1: Sega Dreamcast
2: NeoGeo
3: Arcade
I really prefer you stay with PC though, as there are already companies *GameTap* that have older games emulated. I do think the PlayStation is due for release into the wild, but Sony is not known for giving up anything ever so I don't expect to see it.
From the list, the Wii has the Super Nintendo/Nintendo 64 stuff, as well as some Genesis. That Tap place has alot of arcade,NeoGeo, and Genesis stuff as well. Amiga Forever and C64 Forever are worthy causes and have kept those devices alive in emulated form.
Really, the only ones that are not already done enough are Dreamcast and Playstation 1 and 2. My .02 as it were.

Arcade
Neogeo
Dreamcast

That would be actually great :)
1.Arcade
2.Amiga
3.Commodore 64
Here you go :)

1.amega
2.c64
3.arcade
but all emulators must allow you to use your own roms too.

1. dreamcast
2. super nes
3. neo geo