For everyone who wants to get a new VPS Windows: please be aware, that most providers change their offers these days. The offers will go far better than before. So it is a good option to not select a contract length of more than one or three months to be able to switch to a better system in short time.
Some providers do offer more RAM and more Cores for the same money, and also the option of SSDs which become important if your UniGUI application makes heavy use of database servers. Here in germany keep an eye to Strato and HostEurope which offers very attractive VPS systems these days. As far as I see contabo only do offer the SSD-option for the root servers, but I am sure they keep an eye at their competitors and will offer SSD also for the VPS systems in short time.