ahhh, the quest for the best line. many thoughts go into this one for some, others try to find the best deal.
what type of climbing will you be doing?
if you are talking fat vs skinny, probably just a single line then...
when i was looking to buy a single rope, i looked at 60m ropes only, and wanted the most durable, burly lead line i could get. did not want some skinny rope or to be handling a cable either. the best balance was the 10.3mm sterling marathon. higher thread count on the sheath, reasonable impact forces, very nice hand, drycore, and very reputable manufacturer. with over 500 pitches, it is still riding strong. a great line indeed.
had a beal and it sucked. eidlewiess last long. bluewaters are fine ropes too. mammut make very good lines, as do pmi.
how large is large anyways?