Choosing between 720p and 1080p on Mini connected to Sony HDTV (1920x1080)

I have a late 2009 Mac Mini and a SONY HDTV and had no difficulties at all in hooking them up. I just connected the Mini Display Port to DVI connector which ships with the MAC Mini to a Belkin DVI to HDMI cable (also available from Apple Store) and connected the HDMI to my TV. I switched on the TV, selected the correct HDMI input, then switched on the Mac Mini and could see the picture immediately. I was missing the menu bar at the top so went to SYSTEM PREFERENCES and then DISPLAYS and the OPTIONS tab, and unselected OVERSCAN, and that gave me a perfect picture (slightly smaller than full screen but perfectly adequate as far as I'm concerned).
By default my resoluton was set at 1080p (presumably the Mac detected that the native resolution of my TV is 1080p). The DISPLAYS box shows a number of resolution with a little TV screen icon beside them, as if suggesting those resolutions for use with the Sony. It shows 480i, 480p, 720p, 1080i and 1080p. There are also lots of others without TV icons beside them.
The only problem I found is that 1080p made it quite difficult to read text on my screen, even though it's not very far away from the sofa. My eyesight is very good but I couldn't read the screen comfortably when surfing the net or even when changing settings etc. I swiiched, therefore, to 720p and this produces a very comfortable size of text for using the MAC.
My question is whether it really makes such a big difference whether one chooses 720p or 1080p, as I really can't see much difference for playback of video from Hulu or other streaming websites. Even when I played a DVD movie from the Mac Mini superdrive, the difference in quality was hard to detect. I guess if I tried viewing Full 1080p HD material, there would be some difference, but how much of such material is available on the net anyway? I take it that switching between 720p and 1080p wouldn't cause any harm, if I chose to do so occasionally for watching any Full HD movies that I rip?
Look forward to hearing views!

Hi- I also picked up a mini a week ago, and have it hooked up to my Sony HDTV via HDMI, just as you. The same thing happened the first time I connected the mini to my tv- with overscan on, the top and bottom of the screen were cut off.
The solution is to pick up your Sony remote, go to the onscreen menus, and make sure that 'full pixels' option is selected. When you do, the screen will be absolutely perfectly aligned.
I mention this because while in overscan mode, I find that the Sony makes an absolutely beautiful screen, and text is quite easy to read, albeit a bit small.

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