Agree with PP, it really does depend on what you want for your fees. If you're looking to pay for fields, space and nice looking grass/buildings then it is entirely your prerogative to do so. However, it is important to not loose sight of the other reasons for a private education, one of which includes the results/extras; ergo, the life chances you will be affording your DD.
A superb example is that a friend of mine, with a very, very intelligent DD (I posted right back at the start of this thread) was torn, recently, between Tormead and Priors field. The reason was the warm, friendly and 'happy' vibes being given off by the priors field marketing department. Now, PF might be all those things, and they're clearly pushing it as their USP, but nothing detracts from the fact that you can get a happy, well balanced education at Tormead, with stunning results to boot. She soon snapped out of it and realised her DD could cope with Tormead, have fun, enjoy school and get the results her intellect will afford her.
My advise, think about what you actually want from your money, think hard, look past all the marketing and then decide.