Not sure what to do.

[nick crisp]

Been there, done all that, went back to a fazer every time!
First bike, boxeye (put 30k on it in just over a year)
Aprilia Futura.
R1 (ended up streetfightering it as I wanted a fazer thou, and kept it 7 years)
Gs500 for work (as well as the R1)
Sv650 for work (yawn)------"-------
Fazer 600.---------"----------
Sold the fazer and R1, then bought
Tiger 1050. Kept for 4-5 month and swapped it for my FZ1 which I still have.
Inherited my sons boxeye for work for 10 months and gave it back(when he got his licence back).
Bought a tdm(Zzzzzz). Swapped it after 3 months for a bandit 600(big yawn). Sold bandit after 2 months and got a thundercat which I like. Still crave a fazer foxeye though!

This doesn't include bikes I've borrowed, ridden, and given back in a hurry.

All this has taken 12 years, but the moral of the story is, I've always gone back to a fazer!!

Get out there and try other bikes by all means, but you'll still have that warm spot for probably the best do-it-all bike of the last decade and a half.

No doubt about it, there are very few bikes with the versatility of the Fazers. Personally, I still don't want to give up my gen 1 for any other bike. But like you Stevie, I went through many bikes before I discovered the one that I can live with and enjoy long term (and have I ever mentioned that I'm on my 4th one in a row?  :lol ).
But also Stevie, I notice that many of your bikes were what might be considered as commuters. For me, biking is first and foremost about fun. You don't buy a GS500, ER5, CB500, GSF600, TDM etc for kicks (although each can probably supply a bit of that, simply from the "2-wheel innit bruv" point of view).
My list was always aimed at getting excitement out of bikes: 750 Turbo, GSXR750 & 1100, FZ750, RG500, Stephens stage 3 YPVS, Denco 750 H2C, FZR1000; although there have been one or two commuters as well, and a 3 bike passion for Z650s, plus a Z1 (had to have one, but didn't ride it much as by then I was used to much better bikes).
Go with your heart Noggy - commuting is what the car and those average 500s are for - you ride for the enjoyment, so make your next bike one that gives you a grin each time you go out on it. You can always trade it if the novelty wears off.