Ken:
Lets a take a deep breath, step back, and evaluate the true question. I've encouraged you to buy the pigeon gun, since that's what I'd do (actually I wouldn't... I can buy a whole rack of guns more suited to me and my shooting style for the price, but sudden wealth would change my mind).
You are about to spend a load of money on one gun. You've declared that only a Purdey will fill this void for you, and one gun is the limit. That gun should be a gun that you are SURE in your heart of hearts is the correct gun.
If you have to ask, this one might not be it. Don't decide on the basis of what others advise - this must be a personal decision, and you should not feel the need to justify it to amrchair experts.
You've had some excellent advise contrasting game vrs. pigeon guns, and the descriptions are right on the money. I'd chose based on what I shoot the most of and enjoy the most, as should you.
Report back!