Light but Strong "Occasional" Lock

I'm looking for a lock that I can use for long and/or multiday rides that I can use to lock the bike up for 5 minutes whilst I'm nipping into a cafe or cornershop and will defeat the opportunist thief. Cost doesn't really matter I just need it to be slightly lighter than Abus Manhattan D-lock that has given me years of sterling service.
Any ideas?
Any ideas?
ROAD < Scott Foil HMX Di2, Volagi Liscio Di2, Jamis Renegade Elite Di2, Cube Reaction Race > ROUGH
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ETA The cheaper option is probably lighter as well.
Marin Nail Trail
Cotic Solaris