Yea, I don't have a modded anything, but I recognise that they are available. As far as GC and DC you really don't need to mod to play imports. I forgot about Star Soldier and Fantasy Zone for GC. So with out modding anything you have:
Shikigami 2 (GC)(DC Soon)
Star Soldier (GC)
Fantasy Zone (GC)
Ikaruga (GC)
Border Down (DC)
Psiviar 2 (DC Soon)
Shikigami 1 (PS2 butchered and released as Mobile Light force 2)
Gunbird (PS1, butchered and released as Mobile Light Force 1)
Gekhio Shooting King (PS1 a port of Shienryu)
R-Type Final (PS2 Comming next week)
Gradius 5 (PS2 this year)
Iridion 2 (GBA)
Xyanide: Advance(GBA comming soon)
Xyanide (XBOX possible shmup)
All these w/o modding

Still, even here it is decent.