hi timstone8 - like you I to have an 09 R1200GS - owned for about a month - PO had a low seat fitted. I'm about 6' tall and find the low seat & standard pegs cause me considerable pain in my knees
I purchased these from Suburban Machinery - certainly a nice peg in my view - make a significant difference to my comfort level although I'm still contemplating either swapping my low seat for a standard seat or buying a standard seat
I've been using Pivot Pegz for a couple of years, and if you stand up on the pegs a lot, they are brilliant. Even if you stay seated, they are much more comfortable than regular fixed pegs. If you can get over the cost, you won't be disappointed.
+1 They are the dogs and worth every penny. They have optional rubber inserts to if you want them (why I don't know). Until you try them you can't understand how much better they are - not just for standing up but for road riding too.