I'm a bit out of date with the pc buying / upgrading malarkey, but anything you'd like to keep such as the card reader could probably be removed from the old pc and put in the new one.
The Medion offers a 2 year guarantee and the various Medion laptops / external hard drives I have bought have served me well in their time. The graphics card on this one seems better than the Acer one which seems to get slagged off for performance. Doesn`t mention an ethernet connection for my internet but I assume that is the LAN input?
My biggest regret would be losing windows 7 which I have liked for the unknown windows 10 and I hope I would not have any compatability issues with CS6 and Lightroom 3.4 etc although I`ll miss Live Movie Maker and DVD maker which came free with windows 7! I`ll miss the multi card readers that were built in to my Dell too - not just SD but I do have other card readers so no big issue.