Did Pembereley rally exist? I somehow doubt that JA had one particular house in mind when she wrote P&P. Here's a link to an archived conversation that discusses this.

A very old thread

You might also like to look at the following page, which is my write-up of a possible contender for Pemberley.

From the travel journals

Dovedale was- and is- a renowned beauty spot.It's very rugged- it's a favorite with hillwalkers. Here's some URLs for pictures and descriptions.

http://www.peakdistrict-education.gov.uk/Fact%20Sheets/fz8dov.htm

http://www.ashbourne-town.com/villages/dovedale/

http://www.derbyshireuk.net/dovedale.html

I hope that helps.