Don't even consider using a C&L 76mm (sorry slayer) on your 347.
I've heard good things about the meters from Anderson, unfortunately the use of them isn't all that widespread (yet), so feedback is going to be minimal.
Anderson is most known for using quality products, so purchasing based on their reputation IMO would be acceptable. If you call there, more than likely Rick will field your questions, so i'd ring them and get a feel for what they have to say.
You could also go with a PMAS 80mm.
But you will likely have to find it on ebay, since i think 80mm units aren't made anymore.