I fitted a Zero Gravity (click here for pics). Very happy so far... other recommendations are Powerbronze, MRA and F.Fabbri... they all have different shapes, so down to personal preference really.
MRA here, the difference over OEM is significant. http://1000rr.co.uk/mods-upgrades-accessories-products/1792.htm
Although i have not got a 1000cc bike (i have a 954 Blade), i decided to get the genuine OEM smoke touring screen for my bike, i was put off any double bubble screen when a rather experienced Honda guy asked me why did i think Honda have not manufactured one..... i did'nt even think about it.... he then pointed out a number of bikes he had come across where at certain angles on bright sunny days a DB screen can melt the clocks ! So i have gone for OEM instead, and its a really nice screen and looks a lot better than the chaved up '' iridium '' jobbie the previous owner had fitted.... yuk.