In reply to Oujmik:
These days I'd be fairly wary of spending much money on specific mountaineering ropes. As soon as you start doing things like direct belays, counterbalance abseils or even moving together you rapidly trash ropes.
I took a fairly new 30m single on Tower Ridge recently. In hindsight was a fairly poor decision as we were practicing short-roping and short-pitching during our ascent and it took a major hammering.
Using older lead ropes, single or half, cut down to 35-40m is going to be a cheaper option in many situations. Also, I can't think of that many situations where I would be so totally focused on cutting the weight of my rope to the stage of taking a shiny new sub-8mm rope on something like the Cuillin where I definitely planned to use it.
Post edited at 17:42