Unless you commute regularly now and have a pretty good idea of what you want I wouldn't spend even $1000 on a bike.

I'd shoot for something fairly basic, commute for a year and then spend the big bucks on your 2nd bike. Or not. You may find the accessories like a good saddle, quality lights, clothing, etc. are what is worth spending the money on.

Often what the extra money buys you is lighter components with additional features, - not necessarily better durability. Then when it is time to replace something, you pay more again for the replacement.

The only reason I'd be tempted to spend a bit more is the distance. 12 miles each way isn't terribly long but it's not short either. It's far enough that you might want to consider a commute worthy road bike and that will push the cost up a bit.