deksawyer
E*POWAH Master
LITELOK X3 or Hiplok D1000/DX1000. The weakest link then would be what you attach them to.
www.litelok.com
hiplok.com
hiplok.com
Pragmasis chains and anchors are worth a look as well.
securityforbikes.com
None of the above are cheap, but when all your toys are stolen in the middle of the night, it hurts. I know.

LITELOK X3
The World's Toughest Bike Lock. 20x more angle-grinder resistant than the best performing D-lock, the ultimate in bike security.


Hiplok D1000: Anti-Angle Grinder bike Lock | Hiplok
The Hiplok D1000 is sold secure Diamond and the first anti-angle grinder bike lock. Designed to stop angle grinder attacks,


Hiplok DX1000: Anti-Angle Grinder Motorcycle D Lock | Hiplok
Motorcycle D Lock. 1000 Series - 1st Anti-Angle Grinder Motorcycle Lock. Sold secure Diamond & ENRA approved. Features Ferosafe. Independently Tested

Pragmasis chains and anchors are worth a look as well.
Security Chains from SecurityForBikes, by Pragmasis

None of the above are cheap, but when all your toys are stolen in the middle of the night, it hurts. I know.