In reply to Bendb:
The permutations of rope brands, lengths, thicknesses, features and people's opinions are almost limitless these days. So you need to be quite realistic about your needs and budget or you will be overwhelmed by all the options.
For many, the basic spec is a pair of 8.X mm ropes suitable for rock climbing in the UK in the dry. Therefore a pair 50m long and without any special 'dry' treatment will work fine. Remember, ropes have a finite life, (Somewhere between 2 and 20 years depending on use and who you ask), so this is not the last pair of ropes you buy. So only buy for what you really are going to be doing in the near future.
A pair of basic, good weather cragging ropes can be bought from Rock & Run or Decathlon for around £130. As your aspirations increase (winter, Alps, high altitude, etc), then longer, thinner, lighter, better water resistant ropes become more desirable, but in general, that all adds to their cost.