Bondhaus Goldguard for Allen keys - expensive but the heads dont round off (approx £20)
Park mini chain brute tool is the strongest I've used - the pokey bit doesnt wear out too quick (or bend) (approx £15)
Park crank puller (approx £15)
Shimano Cassette tool
Bahco 'Piano Power' cable cutters (approx £25)
Quality socket set (Halfrauds £69)
Bahco adjsutable spanners (£15~£25)
Spokey (Mines 15 years old!)
BB pullers need updating fairly often, my Pedro's cant do splined...
Angle grinder for those tendon severing moments....