I've had hybrid bikes for the past decade. My current ride is the Spot Brand ACME with Alfine 11 & Gates Carbon CenterTrak Beltdrive:

http://spotbrand.com/bikes/product-page/acme/



This has checked a number of boxes on my ideal bike list:
1. No chain & gear cleaning
2. No risk of getting my office pants greased/damaged
3. Very effective disc brakes for the regularly wet weather rides I do
4. Shifting gears while at standstill waiting at a light (lots of city riding)
5. Gear ratios that meet my commute needs
6. Alu frame/carbon fork
7. Ease of changing the rear tire due to ingeniously designed pivoting drop out brackets that do not require resetting belt tension

While this bike is quite a bit heavier than my previous all carbon Devinci Helsinki hybrid (19 lbs vs 23 lbs), the Alfine & Gates setup have surpassed my expectations.