So far of the blades I have tried Wilkinson, Merkur and Gillette, in that order, the Gillette have been the best. They were also the priciest. I can get the Wilkinson blades for €2.25 in Tesco, the Merkurs were free with my Futur, and the Gillettes were €3.75 in the only Chemist in town that stocks them.
DE shaving won't be as economical on blades for me as for the rest of you as all the shaving stores are in the UK or US. From the UK 10 Crystal €3.20, 10 Derby €3.02, 10 Feather €3.65, 100 Dorco €11.21, all plus postage to Ireland.
All that considered it still beats cartridge shaving once you get past the cost of razors, brushes, soaps......and multiples of each to feed the addiction.
[FONT="Comic Sans MS"]Merkur Futur, Wilkinson Blade, ToOBS P2233 Brush & ToOBS Eton COllege Cream[/FONT]