The Yamaha YZF600R Thundercat is the full model name for the bike, often referred to by the various models you have quoted. I have recented bought a very tidy 98 model, after owning the Fazer 600. The Fazer was very good, the Thundercat is even better. I can thoroughly recommend it as a good all-rounder. I paid £2,300 in the UK, with the intention of spending up to £200 on items such as new drive chain, standard can, etc.