@Moot

Im happy for you to chuck me into the picking pool now if you like.
Don't mind which faction, both if it helps or Nintendo to make up numbers.

OK cool will have a hunt this evening and find something mostly playable.

I've spent too long looks at lists, so I'll just settle on something I almost picked yesterday - Monster World IV on Megadrive.  It's the Wondergirlboy that didn't see a PAL release.  I'm pretty sure there's a ROM in English on my Pi, will have a look later.

Slight snag,  I've just remembered the English language Monster World IV I played briefly would've been on XBLA.  I doubt there's a converted ROM knocking around, but you never know.  Will double check the Pi later.

MW4 is uploaded to the b 'n b Dropbox account. You can find it in the MD rom folder.
It's a dejap translated rom so should work fine. Text displays in English so game is playable for English speaking audiences.

I'll upload the Jetsons rom too soon.

Also, if you're looking for interesting roms I suggest yuu yuu hakusho for the MD. Reasonably obscure game by Treasure, the devs behind gunstar heroes.

Do re mi Fantasy on the SNES is also a gem in the rough. Cutesy platformer done right.

MWiv looks fantastic and is a solid pick.

Playing through Wonderboy the dragon's trap remake now and it's amazing. Retro done right.

Gave Monsterboy a go, all be it in Japanese.
I seemed to go right, a lot, there were some bubbles.
Will see other's verdicts and grab the English sub next week I think.

I'd rate Treasure pretty highly - looking at those platforms you have:

Gunstar Heroes on MD
RSG and Guardian Heroes on Saturn
Bangai O N64 & DC
Sin & Punishment on N64
Gradius V on PS2
S & P 2 on Wii

all candidates for top 5 on those platforms.

There's Ikaruga on GC and DC too.

Even their mis-hits have some credit - quite fond on Warioworld on Gamecube for example.

Dynamite Headdy MD (even better than the excellent Gunster imo).  Astro Boy GBA.

I hope you get a massive urge to play handheld consoles in a few years, you've missed some gems.  GBA also had the Treasure boxing game, which I own but haven't devoted much time to.  Hajime no Ippo - supposedly very good.  

Alien Soldier gets a lot of love but I really don't like it, and I've tried many times.

Mischief Makers?

Only played it briefly, I've heard it's good but I didn't give it enough time.

The rest:

Super Gunster Heroes is reasonably good on its own merits but terrible when compared to the original imo.  The vertical shooting sections are surprisingly atrocious.  See also: Guardian Heroes Advance.

Tiny Toons on GBA is shocking from what I played.

Wasn't keen on Light Crusader.  

The McDonalds one was quite good (for a McDonalds game - also has some excellent translation issues).  

Freak Out was fun but nothing special.   

Never played Silhouette Mirage, looks great. 

also never played Silpheed on PS2.  

Bangai-O on DS seemed to be an excellent game ruined by overdoing things, it suffered from terrible slowdown.  The XBLA HD one might be good, but Level 3 destroyed me.  So tough, so early on.  

I don't recognise the rest of the games on the Wiki list that haven't been mentioned.

Loving the Treasure love. What a fucking team.

I think the team at Konami who did Bucky o'Hare (nes) were pretty much the guys who left to become Treasure. Easily in my top 5 Nes games, arguably top 3.

Maybe we should think about setting some ports of games against each other? The Disney platformers spring to mind - I believe they were quite different on SNES and MD.

Maybe there are others to consider such as Alien, Castlevania , Streefighter, Aleste, Smash TV etc?  Don't have to be ports - just different entries in same series or licence.