In reply to Greasy Prusiks:
Just stacking up the five best pitches one can think of is daft; if that was what was needed, the OP might just as well have asked for people's five favourite pitches. What is needed is a coherent route. To me that would really have to mean the same rock type and a nice balance of grade (either some consistency or with the easier pitches being stunningly improbable. And I quite like a nerve calming start and perhaps a pat on the back finish. The order of the pitches also matters. So there are a multitude of answers.
Here is my dream Cairngorm granite E3:
Steeple P1 ( long warm up 5a groove)
The Harp P2 (long, immaculate, technical, slabby 5c groove)
Black Spout Wall P1 and P2 run together (awesome 5c crack and groove) - logical with a 60m rope.
The Spire P3 (amazing, long technical 5c groove and bulge)
Steeple P6 (long, strenuous pat on the back 5b corner)
And my dream Cuillin E3:
Vulcan Wall P2 (Warm up sustained 5a crack/wall)
Uhuru P2 (superb, long, technical 5c wall/slab thin crack)
Spock P1 (long, absorbing, varied, slightly bold 5c)
Enigma P3 (stunning 5c headwall crack)
Overhanging Crack on the Cioch (butch pat on the back 5b crack)
And my dream Beinn Eighe E3:
Groovin High P2 (long and surprising 5b corner)
Pale Diedre P2 (massive 5c corner pitch)
Angel Face P2 (Outrageous 5c)
Sumo P2 (brilliant, escalating 5c)
Sumo P3 (constantly surprising 5b on perfect rock where the holds do appear!)
And, of course, a dream Cromlech E3:
The Gates (5a to get going)
Left Wall (5c to get properly warmed up)
Memory Lane (5c to get head sorted)
Foil (5c to test the forearms)
Grond (5b fun pat on the back finale)
No coincidence about the grades - for me, a dream route will be challenging, but manageable rather than desperate. Which is generally about E3 for me.
Post edited at 23:37