You must ride at a pretty sedate and leisurely pace, Mark, if you think the OEM Battlewings stick as good as Metzler Tourance EXP's... I've only run the Tourance EXP's on my Super Tenere, but I've ridden plenty of bikes with Bridgestone Battlewings and they're not a tire I would choose no matter how cheap they were.
There's a new Metzler Tourance coming soon, Triman11427. It's called the "Tourance NEXT", and it looks pretty good for a 90/10 dual-sport tire...
I've been pretty happy with the price/performance ratio of the Tourance EXP's. My dealer keeps 'em in stock for me, and his prices for mounting and balancing are more than fair. I'm on my 5th rear EXP and my 3rd front. I'll do one more rear and that will have the front worn out. At that time I will probably try the new Tourance NEXT above, or perhaps the new Michelin Anakee 3 that just came out. Here's what they look like...
Just as an aside, these two tire brand/models are going to be the OEM fitment ones on the new 2013 BMW water-cooled R1200G/S, so one would imagine they have the latest tire technology out there. That said, there are a bunch of guys over on ADVrider who swear by Dunlop TR91's and Continental Trail Attacks, so you might want to look at those, too.
Just FYI...
Dallara
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