u'll have to verify the 50 euros part but assuming 2:1 then the
typical first answer for pop/rock type recording/listening is often
the Sony MDR-7506. A bit bassy. (Understatement) A very good choice. I
If you're more of a jazz/classical listener then I much prefer my AKG
K240's but they're typically a bit more expensive.
Thanks. And if I say
that I want to use it for practising bassguitar
(and maybe guitar and keys), does that have influence on your advice?