I am in the same camp as Jim(big dog) on this issue.
I have sat in his car and it is a very nice set up, and worth whatever it cost.
I went with the sparco circuit pro. this was something i did prior to being in Jims car. it was about $780 shipped to my door from saferacer(with my %10 SM discount code).
if i was starting over, i would realy look at what jim did on this issue closely and maybe have gone that route.
getting in/out is not an issue for me 6', 200lbs.
I have not used a right side net, but for me, i just dont see how one could compare to a halo seat. my vision is not impaired with the seat, and my lateral head motion is restricted on both sides.
I went with the halo because for me the right side net just seemed like a way to pass the rules, but not get the most protection in this area.
the halo seat with the HANS "feels" like it will offer me the best available proection.
safety is a presonal choice, so the only real right answer is for you to do your own research, like you are doing, and come up with your own best approach.
Josh