In reply to smbnji:
Millions of options...
I do those sorts of things with 2x 50m:
One is a triple rated 8.7mm Mammut.
The other a skinnier/lighter 8mm (you could go slimmer).
That gives plenty of options for doing classic mixed routes or going lightweight, but still good for double rope stuff. I don't use 60ms for the weight thing.
Sometimes when scrambling around I wish the thinner rope was 60m so I could get down the odd 30m-ish ab with just a single, but that is quite rare.
Everyone develops their own favourite system. Depends on how your alpine adventures progress. eg. I walk in a lot and don't use lifts much.
You can always change systems in a few years when you work out what works for you. I change every few years. Also, as you age and your body craps out you do different things, and need different ropes.
Good luck. Have fun.