The band that would make my day would probably be something the lines of:

Vocals - Taylor Hawkins (Foo Fighters and Taylor Hawkins & The Coattailriders)

Lead/Rythm Guitar - John Frusciante (RHCP)

Lead/Rythm Guitar - Mark Knopfler (Dire Straits)

Bass - Cliff Burton (Metallica)

Drums - Dave Grohl (Nirvana and Foo Fighters)

May not be the best band together, but they do know their stuff. If they could work it out I bet it would be awesome!