Alright, I'll kickstart this game, sure.
While I wait, what's the best Gameboy Advance / ds / 3ds Castlevania... looking for action rpg ala Symphony of the Night, mainly. Amazon has em all pretty cheap when I checked earlier.
Aria Of Sorrow is the best GBA 'Vania. It was the last one released and is a sequel, of sorts, to Symphony Of The Night, taking place in the year 2016 IIRC. Also has a fun plot twist. You can pretty much skip Harmony Of Dissonance. Circle Of The Moon has the best music out of the three GBA games, but doesn't look as good visually and the level design is just OK. It pretty much screams "launch title game," which it was.
Dawn Of Sorrow on DS is a direct sequel to Aria Of Sorrow where you play as the same main character. There's also a cool bonus mode where you play as three other characters, including SOTN Alucard, in a nod to Castlevania III. Portrait Of Ruin's gimmick is that you play as two characters at once. Its setting is during WW2 and it's actually a follow-up to the Genesis Castlevania Bloodlines. It's not bad and worth playing if you want more 'Vania. There's also bonus characters to play as (most of these games have extra characters) including Richter and Maria from Dracula X! Finally, Order Of Ecclesia was the last 'Vania released from IGA. I didn't get as far in this one and need to go back. It's still a Metroidvania but has multiple smaller areas. You play as a female who uses magic instead of weapons, but the magic functions exactly like weapons would.
Would highly recommend Aria Of Sorrow on GBA. It's the second best Igavania after SOTN, IMO, and would surpass it if given put on the same visual/audio level as the PSX game.
Skip the other Castlevanias that came after these titles. Mercury Stream