Same boat as you, and with this damn ULEZ coming in April 2019, I'm forced to swap for something else as I commute daily into centre. But I don't really have space/funds for commuter bike + weekend fun bike.Like you, I like the balance of power, economy, comfort and practicality. Other things that put me off replacements is the lack of tank range - I'm gonna really miss getting 230 miles between fills.I've looked at:FZ6 S2 - obvious option. Seem to be fetching £2.5-3k odd recently.CBF600s - felt a bit more torquey, but less top end power. Also very bland looking, but are cheapSV650 k7 - possibly an option, but 73 bhp on paper and range of only 160 miles.ER6 - meh, basic learner bike, too weedy and budget.Gladius - ditto, even if just a cheap updated SV650.CBR600F - nice option, but insurance is silly for inner London postcode (£1.2k odd!)GSX650F - looks alright, but bit on heavy side, 150 mile range, basically a bandit in nice fairing.BMW F800S - Seems a nice practical commuter, but reports are it can be rather tame/bland to ride (especially compared to FZS).MT07 - has the looks, but looks a bit whimpy on power compared to FZS600 and bit dinky for tall rider.MT09 - looks fun, but too pricy still - so insurance is too high in London.Tracer - too wide for London computing... Seen some poor reports on longevity (corroded leaking oil pump on front of engine after 2 years!)Street Triple - Silly insurance in London.So yeah, I'm still no closer to a decision and time is ticking on...
My work colleague has a DRZ400 (BIG SuperMoto) which I quite fancy. Would make a fun commuter too. High, plus great handling. "Youthful" image though/not so refined!
I know space may be an issue but what about just a little 125 for the commute and keep the fazer for the weekend and evenings, In London you can not go any faster on a Fazer than scooter can you ?
Have you thought about a BMW F800ST?