I've used a HH for about 5 or 6 years, and am very happy with it. I second the recommendations on the larger tarp; I have the standard tarp (I bought mine before the larger one became available) and often wish it covered more.
I use a Big Agnes sleeping bag, which doesn't have bottom insulation - just a sleeve to securely hold a sleeping pad. I've made a pad/reflector from a mylar windshield cover and some fleece material (a common DIY mod for HH users.)
In warm weather I use just that reflector pad, in moderate weather (most of the year here in OR) I put it on top of a Ridge Rest pad and put them both in the sleeve. In cold weather I put the reflector on top of a Thermarest pad.
It is the most comfortable way to sleep in the woods!
-=[ Grant ]=-