Thanks a lot for all the help so far. I'm going to do additional research on all the amps mentioned here. It's a bit of a maze so far, can't seem to make a decision.
I've decided to increase the max budget to €1500. I just want to be done with it and get good enough quality in 1 go(whether that will cost €500 or €1500 doesn't matter). The only thing is it needs to be an all-in-one amp. We don't have the space for multiple devices. It will ruin the "set up". Also, some budget from the speakers came free because i called the shop to negotiate the price and they decided to give a €160 cashback.
I'm thinking about ordering two at the same time, and keep the best sounding one. I'll ask the shopowner if he/she is ok with that. Maybe one that's a bit more high end and a lower end one. To see if the differences are big enough.
Now only thing remains is to pick two out of all the ones mentioned. I'll have made my choice after this week and order next week.
Till that time more ideas are always welcome ofcourse.
Thanks again!!!