Ikaruga on DC fo sho! I have a burnt copy my brother gave me, I wish I could send you that lol.
I still can't perfect Stage 2... FFFFFF--- after playing Touhou for ages. They're both completely different in gameplay though.
I'm probably am going to pick it up at XBLA. I have Sonic Adventures (not DX) on XBLA too :]
Dragon Warrior, Dragon Quest for SNES
Secret of Mana (amazing game, hack and slash 2D) for SNES
Seiken Densetsu 3 for SNES (basically Secret of Mana 2)
Secret of Evermore (amazing game too, same people who made SoM) SNES
Super Metroid (we all love this)
I used to play Virtua Tennis on the DC too, I loved it.
Power Stone, Power Stone 2 for DC. Two of my favorite games back in the day