Since you are building a gaming computer, and you have a k model Intel, I guessing you plan to overclock?
If that is the case, your budget needs to include an aftermarket cpu cooler as well.
I can't give you prices in euros/pounds, but I can give you suggestions of decent boards at modest US prices: Asus P8Z77-V LE or LK; AsRock Z77 Extreme3 or 4; Gigabyte GA-Z77-HD4; MSI Z77A-G45
For a cooler, the CoolerMaster Hyper 212 EVO is hard to beat for the price.
Mark