KMC chains?

the bike is a 1995 Yamaha FZR600, and riding is predominantly street, with only 1-2 track days per year

the sprockets that come with it are no-name steel ones, in the stock 15/45 gearing

I can get all of it, brand new, for $50

I figure for an old, relatively underpowered bike that doesn't get ridden much, $50 is a steal