I think Lexus are now making hybrids that don't require any plugging in? Can't say I've kept an eye on the hybrid market as I've always fallen outside the intended market. But you'd be paying for a brand new car; even "keeping it until it dies" you'd still experience a lot of service costs that any other car would.
If the goal is to save on your current fuel and ownership costs, buying a new car isn't one of them, especially with only 7,000 miles a year. Heck, my 2006 civic 1.8 returns much better MPG than that, and has negligible servicing costs. Granted, it isn't going to be brand spanking new, and it may not have auto-braking, but I'm sure you could find a spec with everything else. And you'd be saving half your budget whilst at it.
I know you've said that you park 1/4 mile away from home, and can't charge at work, but what about other opportunities in your lifestyle? Do you do a weekly shop that has outlets for charging that you could utilize? You do so little mileage that it wouldn't take long to charge for day-to-day use I'd have thought?