I have a set of Clymer gauges for 5.56 that work perfectly well. Pacific Tool and Gauge have a 3 gauge set for $87 and they seem to be really well-liked as a company. I bought a set of 6.5 Grendel gauges from them since no one else had any in stock or date on when they would be off backorder.
If PTG has the gauges in stock they are the ones I would look at, if they don't I wouldn't buy from them if you need them sooner rather than later unless they can give you a firm date on when they will be back in stock. My Grendel gauges had to be built to order and 6-8 weeks ended up being 10.
http://pacifictoolandgauge.com/saam...saami-headspace-gauge-set-go-no-go-field.html