I really think this comes down to personal preference (I know, what doesn't?). Some people have a high tolerance for skeeters buzzing around, as well as minimal reaction to bites. One of my hiking buds is impervious to skeeters. They seem to pretty much igmore him and bites literally do not show up at all when he does get them. I'm jealous.
I tried the headnet thing since it was suggested to me as a way to reduce weight, but I woke up a couple times with it (and some skeeters!) resting on my face, and a couple other times with some of it in my mouth. I'm a very active sleeper. ;)
I also tried an inner bug tent, and found that to be on the opposite end of the spectrum: More protection than I need. So, I'd rather carry less weight.
As you might guess, I'm now looking at bug bivies. I don't think bug tents offer much more practical usable space under a tarp; in fact, I think they deduct from it in general (barring Alaska-esque mosquito nightmares). IMO a bug bivy is the best solution for complete bug protection under a tarp.
I have a feeling that to find out what works best for *you*, you might just have to go test it. ;)
Edited for spelling. :)