I have about 10 different sets but the ones that live in my rucksack are the metric American Eklind ones- approx £15 (but no 7mm)
Eklind long metric ball end hex - allen keys x 9. Features & Benefits: American made using Eklind Alloy Steel Heat treated for optimum strength and ductility Exceeds ANSI Standards All stored in a compact plastic holder which firmly retains each key in a size marked hole Set...
www.bradfords.co.uk
I have been happy with the quality. As stated previously, the Wera ones are good.
I must confess that a lot of the time, I use long torx bits in my ratchet screwdriver instead of the Allan keys.