I know what you mean abnout butt-ache after an hour or so. After about a month of owning the V-Strom, I drove it up to Butt Buffer in Ephrata, PA (near Lancaster) and had it modified to fit me. Peter (owner) peeled back the stock cover, shaved down the foam to fit my sitting position, then routed out an area for a gel insert. Once that was in place, he covered all with a thin foam, buffed out all of the seams, then put the cover back in place. Outward appearance - just like stock; feel - absolutely great. All for only $125. I left the shop and rode 4 hours straight to get home. No butt pain! A few days later, I road 5 1/2 hours (mostly interstate) withoput stopping for my first ever road-trip. Unfortunatley, that was the last I rode my bike (totaled it - I've mentioned that elsewhere on this website recently).
I highly recommend Butt Buffer. The owner also has a shop in Ocala, FL. He has told me that he also takes seats through the mail. I'd recommend going there - he takes plently of time making sure that it fits you just right.