Personally, I like a vent mount. Windshield or dash is way too hot with sun beating down. In summer I run AC through my dash vents which keep the phone cool. In winter I run heat through the floor or defrost or both, so no heat blows on the phone. I do this whether i have a phone or not, it's just what i prefer, so if you don't, maybe that won't work for you.
Another nice thing about the vent mount is that the phone isn't visible to others nor does it block my view when I'm driving but it's in a great line of sight for me, i just glance over/down.
It also, in my car, puts the phone close enough to the stereo (I had an aux cable installed that plugs into the headphone jack) and the power socket, to let both cords reach easily.
I bought a pretty cheap one on ebay. Do make sure you get a mount with two little feet on the bottom rather than one wide base, because of where our mini usb power plug is.
Here's the one I got, $5.99 free shipping
eBay - New & used electronics, cars, apparel, collectibles, sporting goods & more at low prices
See the little feet that the phone rests on? They allow the charger to be plugged in right in the middle.
Here's the one i had before, without the good feet setup. It was OK, I had to install it upside down so as not to block the power cord, but the new one is much better. This shows you how it looks with everything plugged in.