Ahh yes, the ADV crashbars, i'll give them a mention for you - I've seen more bikes written off than anything saved through having those type of crashbars. The top of the bar acts as a pivot point/fulcrum, once the bike reaches it and goes over the other side you can say goodbye to the tank, handlebars, clocks and all the instrument consul. Especially when the large ADV tank is full.

Result is thousands of pounds worth of damage instead of just a scrapped rocker cover.
I've a standard GS, fitted with the large ADV tank and ohlins shocks and an MRA screen and a corbin seat and i want for nothing.
You can keep the ADV price premium, and use it to get all the correct bits for a standard GS and have a much better bike than a standard ADV at the end of the day.