In reply to higherclimbingwales:
> (In reply to Dan1984) I personally wouldn't buy anything shorter than 50m as you will soon find it isn't long enough for a lot of things, especially when you start to build belays etc. most indoor walls require a rope of at least 40m and some require 50m+.
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Really? I can think of very few walls where a 35m rope isn't long enough. Sunderland, Ratho and Kendal, for example. If you live near one of these, fair enough.
Rope choice is really tricky and really depends on so many variables (I now have more than 6 ropes for example!). No one rope does it all. If you are a trad climber and climb on grit and your local walls are only 15m, then a short rope will be great as you are likely to buy a pair of half ropes for your trad climbing. If you want to mainly sport climb, then a 50m rope will get you up most things in the UK, and a 60m will get you up everything. If you plan to go abroad to sport climb, then you will want a 60m rope as a minimum and possibly a 70m or even 80m.
So, you are right, a 50m rope is the staple workhorse rope for many of us. However, I think that it is a case of "jack of all trades, master of none". My 50m single is now chopped and used as a sandstone top-roping rope. I don't miss it. Therefore, if you know that most of your climbing is indoors and on short routes, then I reckon a short rope (if you can get one cheap) is really handy to trash and will save money to buy a 70m sport rope or a pair of half ropes when the time comes.