ZX6R SF vs Z1000

At the moment i own an 04 ZX6R but after riding about 300k's on the weekend i was feeling very sore. I have always found the riding position of sportsbikes to be a bit uncomfortable and i have had a few issues with back and neck pain recently (not related to riding). My bike has 7000k's on the clock and about 20mm of unused tread on the outside of the tyres.
My question is would it be worth my while selling it and buying a z1000? I have more recently fallen in love with the look of them and other nakeds (mostly bikes). However the bikes in my price range have over 20000k's on the clock and that is causing me to be abit hesitant as i don't want to buy a bike that is going to need new brake discs or tyres etc soon after i buy it.
My other option is to spend a few dollars on the ZX6R and turnit into a street fighter. I think it would look very similar to the z1000 just a bit smaller.
Thanks
Terry
My question is would it be worth my while selling it and buying a z1000? I have more recently fallen in love with the look of them and other nakeds (mostly bikes). However the bikes in my price range have over 20000k's on the clock and that is causing me to be abit hesitant as i don't want to buy a bike that is going to need new brake discs or tyres etc soon after i buy it.
My other option is to spend a few dollars on the ZX6R and turnit into a street fighter. I think it would look very similar to the z1000 just a bit smaller.
Thanks
Terry