For me, it doesn't really matter, since any of those numbers meet my needs. My worst case is a drive to the beach, 150 miles away.
I'd like to very occasionally drive to New York City, which is more like 225. Since that's right on the edge of the maximum range, I would plan on recharging along the way somewhere, maybe at the Hyatt in Princeton, NJ. A 300 miles range would be nice for those trips, but I would make that trip so rarely that it wouldn't be worth the extra cost.
My typical day is 40 to 50 miles, so even if I forget to recharge one night, I'd still have enough left to carry me through the next day.
A lot of the other electric cars are going for more like 60 (R1E) to 120 (Miles Javlon) miles range, which doesn't work at all for me. I think Tesla has it just about right. I hope Whitestar also aims for around 200-250.
I'm guessing that those figures in the Andrew Simpson blog are with the top down (or really, top off). I would expect better ones with the top on, and even better ones with the hard top. Of course, you can also try "premium electrons"; they cost a little more, but should give you a little extra range.
