Nice site, never heard of that before.
If you're going to go for one of the stouts then I can vouch for The Middle of Silence and the can with Pinta is also well regarded, but I couldn't recommend the other bottles at that price despite being good. They've also had better IPAs this year than those from the latest release, but your Calm As Usual(ly) is there.
For reference the cans go here for about 12.50 to 15 PLN (£2.50 to £3), the bottles for 25 PLN (£5), and the x Pinta can for 35 PLN (£7). The bars for when you visit are actually about the same price on draft.