iMac or Mac Mini

[thatch2013]

In 2013 I'll be looking to replace my early 2009 24inch iMac (2.66Ghz Intel Core 2 duo - 4Gb Ram - 640Mb h/drive).

The obvious replacement is the new iMac - 27", 2.9Ghz, Quad Core Intel core i5 / 1Tb drive or fusion drive / 8Gb ram). I would BTO and have 16Gb ram.

However, I am wondering if the 2.6Ghz Mac Mini (Quad Core Intel core i7 / 1Tb drive or fusion drive) maxed out to 16Gb ram would be an alternative. I can't find anyway of comparing it to my present iMac. I know I would have to buy a display but I'm thinking of splashing out and buying the Thunderbolt display then every 3 to 4 years I'll only have to replace the computer (assuming display doesn't fail).

My present iMac seems slow at times so I want something that will speed things up. I am sure the new iMac would - I'm unsure about the Mac Mini. I mainly use Adobe InDesign / illustrator / Acrobat / Photoshop.

Some advice please.