just for ease of install, I'll be putting in my top mount on the bottom of the flange as close to the hose connection as I can. I don't see there being that much of a diff in temp from there as opposed to putting it after the TB on the intake manifold. If I was running a front mount IC, then I would put it right near the throttle body.
As far as sensor, I was going with this one
Its just a GM sensor, so Im sure you can source it locally as well. And I never asked him, but the GM seems to be the one I see mentioned most often.