Erm
Scott, Joe Rocket, Hein Gericke, Rev'it, RST, Weise, Spyke, Spidi
Loads really. The main thing is the quality and thickness of the leather and the armour.
Look around, Alpinestars and Dainese are not the be all and end all.
Personally I wear Hein Gerikce textiles as I find leather a bit too restrictive and warm.
Buff