Apple currently has no plans to release a larger-screen iMac - 9to5Mac
The optional Upgrades for the Apple iMac 27 are not worth it - NotebookCheck.net News
2011 iMac Graphics Card Upgrade | How to | Mac Expert Guide
Nvidia Quadro K3100m 4gb Gddr5 Mxm3.0b Metal Gpu Video Card Flashed Vbios For Imac A1312 27-inch Mid 2010 / 2011 Upgrade - Laptop Repair Components - AliExpress
Picked up this iMac (27", mid 2011) i7 @ 3.4GHz , 16 gb ram , 256 SSD in excellent condition for $210. Should I make any upgrades ? GPU, bigger SSD? Thanks : r/LukeMianiYouTube
iMac 2009 to 2011 (A1311/A1312) Upgrade Guide – MacintoshMen
Apple iMac (27-inch, September 2013) review: New processors and faster Wi-Fi for Apple's slim desktop - CNET