May I suggest the clip on for your headset. The TrackIR 5 I ordered did not come with it so I went to Natural Point and ordered it. I think after shipping it comes to around $45.00 (no need for a hat)

I had the problem you are having at first with the head movement. Before firing up FSX Open the Icon on your desk top for Track IR. You will see in the calibration screen sliders that allow you to adjust the settings. MOST IMPORT! look at the top screen and you will see 3 green dots. Once you are comfortable in your chair manipulate those 3 dots by phyically moving the IR reciever on top of your Monitor so that they are centered in the screen. Now look at the 3d head image and hit F12. It will automatically center your 3d head image in the screen. From now on this will be TrackIR's reference point for center. It does take a while to get use to it but the rewards are worth it.