Brompton owners

Hi all,
I've been a long standing member of LFGSS but know very little about Bromptons, I'm about to get £1000 to put towards a Brompton via the Cycle to Work scheme. I will use it to commute 5-7 miles a day.
A few questions:

1. Where is the best place to buy?
   
2. Which one should I go for?
   
   

cheers

Thanks for all your replies, my voucher came through last week and I bought a 2013 M3L Raw Lacquer from Ealing Cycles on Saturday.

Collecting it this coming Saturday.

Cheers!