I am looking at SSD, 256GB, instead of a fusion drive and then get external drives later. Also upgrading RAM myself makes sense.
I had not considered graphics tablets, Im not into retouching at the moment so Im not sure if I would benefit from getting one.
Blanka, if I could afford an iMac it would be better to go for that than a Mac Mini, right? Better overall performance with a good quality screen in the iMac?
Buy SSD, of course! I would purchase iMac for prof photoshop.
a 2014 Mac Mini with (Iris Pro graphics) eGPU will be a great update but not for your needs...