What would they be? I spent a lot of time thinking about this, & came up with this:

Shell

1. Kalimari Desert (N64)

2. Moo Moo Meadows (Wii)

3. Cheese Land (GBA)

4. Luigi's Mansion (DS)

Banana:

1. Royal Raceway (N64)

2. Waluigi Pinball (DS)

3. Daisy Cruiser (GCN)

4. Sunset Wilds (GBA)

Leaf

1. Vinella Lake 1 (SNES)

2. Dino Dino Jungle (GCN)

3. Tick Tock Clock (DS)

4. Coconut Mall (Wii)

Lightning

1. Dry Dry Ruins (Wii)

2. Yoshi Valley (N64)

3. Bowser's Castle (GCN)

4. Rainbow Road (SNES)

Can't think of them but I can say it will definitely not be any from Mario Kart Wii. I hate every single one of the Wii tracks apart from maybe Wario's gold mine.

Yoshi Valley!

such a mysterious course

I must agree with you i hate most the new tracks !Love all the retro tracks alot more.

DK jungleparkway, GBA Bowser castle, DK GCN Mountain, All the N64 levels, DS Delphino Square and Peach Garden, GCN Baby Park,

Bowser castle

Yoshi Valley N64
Bowser Castle snes (i think there is more than 1, so any one)
Koopa beach snes
Donkey Kong N64 again (my fav track)
Rainbow road snes
Ghost Valley snes (the one that wasn't in MK Wii)

and make all the snes tracks 5 laps not 3

You two are such complainers.... And Peach Beach and many of the N64 tracks are horrible.
I haven't played any handheld karts or the SNES version... but here are my views on the franchise spanning tracks.

Luigi Circuit:- GC > Wii >>>>> N64 (N64 one is horrible)
Mario Circuit:- Wii >> N64 >>GC (All good tracks, but Wii one is best)
Daisy:- Wii >> GC (Daisy Cruiser was a dull track)
Bowser's Castle:- GC>N64>Wii (all very close though, all excellent)
DK:- GC > N64 >> Wii (Wii one is good, but DKs tracks were brilliant on N64/GC)
Wario:- GC > Wii >>>> N64 (N64 one was dull)
Moo Moo:- Wii >> N64 (Added Cows make all the difference, no GC version)
Vehicle:- GC(both)> Wii >>GC(bridge)>>>>GC(City)>N64 (GC only beats Wii at this because it has 2 tracks with vehicles)
Desert:- Wii > N64 >>> GC
Snow:- N64(both)>>>>N64(sherbet)>>>GC>Wii>>>N64(Frappe) (used DK again for Wii, N64s Sherbet Land still rocks though)
Rainbow Road:- Wii >> GC >>>>>>>>> N64 (sucked ass in N64, brilliant for GC/Wii)

Of the rest of the random ones. (6 left for Wii, 4 each for N64/GC)
Well I would put them in this order (Baby Park rocks!)

Baby Park (GC)
Mushroom Gorge (Wii)
Yoshi Circuit (GC)
Maple Treeway (Wii)
Dino Dino Jungle (GC)
Yoshi Valley (N64)
Royal Raceway (N64)
Grumble Volcano (Wii)
Koopa Cape (Wii)
Waluigi Stadium (GC)
Banshee Boardwalk (N64)
Coconut Mall (Wii)
Koopa Troopa Beach (N64)
Toad's Factory (Wii)
Peach Beach (GC)
Choco Mountain (N64)

Rainbow Road from N64. Such an awesome course, and the music was brilliant.

In reply to the OP.... I would have liked 4 cups of the franchise tracks, so 4 Mario Circuits, 4 DK tracks, 4 Bowsers Castles and 4 rainbow roads.

At least that is what I would have liked had it not been half done with MK Wii already (there are 4 Marios and 3 Bowsers and 3 DKs)

So in truth, I would probably want the more obscure tracks like Dino Dino Jungle, Baby Park and Yoshi Valley.

we are not complainers , just perfer the retro levels !

looks like you have some good taste after all