As soon as my Pilot GT front wears out (around 20K), I may try the Venom front. Most here run with the Azaro on the front with the Venom on the rear, so I don't know if the AM41 Venom is a good tire or just adequate, hence the preference for the Azaro.
Avon has not made an Azaro in the sizes for the C-10 front for several years. The Avon of choice right now is the Storm II Ultra. It's the finest front tire I've ever run on the bike, good mileage, great feel, precise steering, and on my scoot very stable. I run the 110/80/18 size on my 2006 and have been more than pleased with the tire.
TB you might want to consider looking at least one more option here. I read where you would like to stay within the stock sizes so I'm taking that to read you don't want the "Plus One" GoldWing sizes and I'll work from there. The Avon Venom is a very good tire that is both long lived and gives great hook up and traction and you can get that tire for the rear in a stock 150/80-16 size; it is a Bias tire but trust me you will never know the difference. As to the front tire PLEASE consider the 110/80-18 size and again I'll state trust me that it will fit the front end like it was made to fit; and that is because it was made to fit as the stock Dunlop that the Concours was delivered with was specially sized and is not really a 120/70 as it is claimed to be. The 110/80 will fit the 3.0" rim with a nice broad round softball profile that will make the bike handle more gently/calmly in the corners; whereas the 120/70 on the 3.0" rim is pinched and pointy. If you will consider the 110/80 it opens up your choices quite a bit as you don't NEED matching thread patterns you only need patterns that compliment each other. My only comment is to never use a "sportier" tire in the rear than you used in the front and you will be quite the happy camper. So I'm saying to look at an AVON VENOM Bias in stock size in the rear and even an AVON STORM Radial in 110/80 for the front. I've not tried this exact combo but Don Ricks who only owns a bike has tried it and liked it and he is very fussy.
I'll inject something here. I have about 5k mi on a 110/80zr18 PR3. It handles wonderfully, plus very stable in slab/wind/big truck environments. Looks like it will go 12-14k mi. Also, comes with factory siping to help with wet stuff, dual compound, fresh technology. It's my new tire of choice.