I totally and utterly swear by "That army black stuff" (Marlow 12mm). You can get it new/cheap if you shop around. It's only cheap as it has exceeded some arbitrary storage nonsense. I bought 220m for £70 which was bargain of the century and it has been utterly flawless. My "Old Faithful" (80m) has been used until it has the familiarity and my fondness of a best friend. It's great rope and my old 30m (of unknown age) was great until I wore through the sheath and retired it. Following that, it was still good for snatch recovery of off road vehicles, I dread to think of the peak forces involved, but it's why I don't get hysterical about old rope.
I am rather tired of dragging 12mm around and lost a bit of my humour. The other day, I ascended a fair old shaft with 140m of it in my rucksack which was pretty torturous. It made me think about alternatives, which brings me on to my mate (and supreme cheapskate) who bought "the cheapest rope he could get" which I gather was 9.5mm mammut (the gold stuff). It went through the rack like a dream and he got loads of it into his rope bag. For massive pitches with no rub points, and assuming I could get the stretch down to about 3% (I like properly static rope, rather than bungee- I figure you are more likely to get in trouble being knackered due to all that bouncing around, rather than falling and snapping your spine on mega-static).
The only thing which has given me a vague "semi" in comparison is Sterling mega-expensive mega-static. However, the price is a quick snap back to army-rope reality.
I'd ask around and see what you can get it for. My mother found 2 new spools of it (2x220m) for £100 the other day and DIDN'T BUY IT. GRRRRR!