Upgrading lock cylinders

[MOBB]

I want to upgrade the standard lock cylinders on our 2 year old house to prevent the lock snapping stories the internet tells us about.

My niece can get Yale 1 star replacements for £23 plus £4.50 per key (not sure if "cheap") which puts it near Avocet ABS price territory I think.

Any views on which I should go for? I would prefer 1 key fits all locks if possible but quality and effectiveness is paramount.