Mmmm... I suposse it has to be realistic, so not 20 groups and not 4 very important groups
It's difficult:
Transatlantic (*)
Pain of Salvation
Leprous
Riverside
(*) = perhaps after hearing Flying Colors I choose them... difficult because I love Transatlantic but, who knows?
I think it's a very good setlist. Of course it would be wonderful Marillion + Transatlantic + Opeth + Porcupine Tree + etc etc... but I think that's impossible...