5-20 Euros per trade is really high! OP is a day/ swing trader so his frequency of execution is much higher than a traditional "investor". I guarantee he will notice such high fees.
Interactive brokers isn't perfect but you can access every asset class / product / market in the world, trades are less than $1 unless you are swinging big, and there is also no inactivity fee. The software isn't the best out there but its definitely not bad.
If you want to go pro, then call up a clearing merchant and negotiate a price per contract. Also, if you do this you will be able to choose from an array of software vendors that the clearing house can provide via third party.
I used Crossland LLC (subsidiary of Wedbush) to trade futures for 25 cents a contract and used TT, a top notch execution platform. My volume wasn't even heavy either so if you hit high volume you could negotiate that down even further.
Message me with questions, I have been through the brokerage hunt before.