I fitted renthals to my 1150. You can use the original heated grips as long as you fit the inserts from the ends of your existing bars to allow the electric cable to run inside the grips.
I used tech 7 heated grips (as recommended by MikeO) and used the existing wiring on the bike etc. Made some adaptors, M16 external thread x M8 internal thread and then threaded the ends of bars and loctited the adaptors in place to allow the standard hand guards to be fitted.
You may need some spacers to get the twist grip to clear the bar end weight, I bought a 4 pack of alloy bonnet spacers from eBay for £4 delivered and cut these down to suit.
I used bars with less rake and then used rox risers to bring the bars back to me.
I hope the above makes sense.