To be perfectly honest I think it is you and the 6 mugs who have up voted you who are lunatics - evidently, you have more money than sense and little knowledge of what the OP was getting at - basically, he's saying the new design far from being a step forward is a step back, further, in terms of user upgrading this seems all but impossible now on the 21.5in iMac - REALLY ARE YOU GOING TO PAY APPLE TO MAX IT OUT WITH 32G RAM?
Have you actually figured out how much the top end BTO will actually cost you - you are paying for design over utility, less meaning more in Apple's book and being price gouged period.
Lets look at it this way, the top end 27in iMac from May 2011 could be upgraded at a reasonable cost to i7 - the SSD cost was huge and I'm not a fan of SSD, but the GPU upgrade was good as was the option of 2G VRAM - for all the complaints, the 27in was upgradable by the owner - hence not an issue to upgrade to 32G RAM, add SSD or add bigger HDD and SSD at a fraction of what Apple want - to top it all it had a Optic's to play/burn DVD's and many professional users of the iMac do this - I should know I sold my top end i7 for US$2000 in early June expecting a refresh and move to better graphics/Ivy Bridge.
Now, do you honestly think we should pay a US$1000 premium on top of the high end 21.5in or 27in iMac to have a decent machine that can last 3 years - a very important issue for business I can assure you.
So, whilst it looks nice, its lost a great deal - no doubt ideal for you, but as someone with a small business who likes the iMac, the prices and what you get are now crazy - indeed, its come to the point to build a hackintosh and link it up to a 30in Dell all for the cost of the top end 27in without any BTO options.
I say this as a Mac user of 20 years - I loved my iMac's, but not at this price and with so much removed/changed to make it appear slim - its a bloody desktop PC for gods sake and not a iOS toy!!!!!!!