Try a 2006 and up FZ1, they're at the small end of the naked streetbike size spectrum. I think only the street triple is much smaller? They might still be bit spendy.
Shouty? I know you said you don't like twins but the Aprilia Tuono is a naughty, naughty bike and the late models are civilised and reliable too.
The only 4 cylinder 600 naked bike I've ever ridden was the hornet and I thought it was bland and has a shite gearbox. Twin again, but I had quite a lot of fun on a Kawasaki ER6N - they're really tuneable too.
Try a 2006 and up FZ1, they're at the small end of the naked streetbike size spectrum. I think only the street triple is much smaller? They might still be bit spendy.
Shouty? I know you said you don't like twins but the Aprilia Tuono is a naughty, naughty bike and the late models are civilised and reliable too.
The only 4 cylinder 600 naked bike I've ever ridden was the hornet and I thought it was bland and has a shite gearbox. Twin again, but I had quite a lot of fun on a Kawasaki ER6N - they're really tuneable too.