Cbr650 I’d say is the best 4cyl bang for your buck. When time came to upgrade the cbr500 to a 4cyl, I nearly bought one. The wife (cfo) made the mistake of asking me to buy what I LIKE. So I sneaked in the ZX6R at 100+k extra. By the time she realized it, It was too late. Haven’t looked back. Then again I’ve been showing her pictures of ZX10R and ZH2 and visited the show rooms a couple of times. It’ll be a while to convince her. One step at a time.