If bass is not your highest priority, then a pair of active monitors would do quite well.
The mackie mr5mk2 is quite good for what it does, if not a little midbassy. You'll have some subbass, just not a lot of it, and there are ways to add a subwoofer easily.
The polk psw10 is a very good active subwoofer for the price,
and the complete package is about 340 bucks (260 euros) so it should come under budget and serve you well for a long time.