I have similar requirement to yours. I live in a very small place and can't afford to leave my bike inside, and I also commute 25 miles a day for work.
And 1 thing I can guarantee you.. doing 25 miles a day, every day is tiring and long. At first it was exhausting me, now I feel better.
I spend about 1 hour and half daily on my bike. About 45 minute each way. Sometimes more.
So I'd advise you to consider comfort and reliability as key factors before anything else.
I've been leaving my bike outdoor for months now:
The battery is locked via a python lock:
And I park my bike outside with battery home every day:
I'm considering upgrading my bike to a downhill bike for even better comfort. To date, with the very DIY look of the bike and because it look cheap, no one tried to nick it.
It has been outdoor every day for months under rain and wind. However I've been using a cover to prevent too much rust into it.
So far, so good. But you probably need to invest something closer to £1500 than £1000 for something reliable. And if you buy from supplier you can get insurance too!