Welcome to racing....I have mentioned a number of times before, the safety equipment will cost a bundle

And I agree with Jason, everything is subjective.
Seat - I am switching to the Kirky this year from the FIA approved Momo I have in the car. In five years or less (depending on the FIA sticker) you will be throwing your $900 seat out. One thing to be aware of, getting out of the car in under 7 seconds with the full halo. At our height, it could be tough. And you will have to do the escape drill in comp school.
HNR - I have a HANS. It is comfortable, does not interfere with my seating and easy to use. There is probably a good reason 99% of the racers use them.
Harness - I use the G-Force pro series with the cam lock. For the price, they can not be beat.
Nets - Like Jason says, get the FIA.
Suit - The only problem I see with the suit you mentioned, is the sizing. If you are worried about fit, get a suit that is offered in the european sizing. Unless you know someone personally or want to spend a crap load of money, you can not get them tailored. The nomex thread does not work in regular sewing machines. The SFI rating is an SFI rating. The cost savings comes in the construction. Little things like zippers and seams. The last thing you want is the zipper breaking on race weekend.
Gloves - Jason is spot on. I have gone through 3 pairs of gloves before settling on OMP ones late last year. What a difference. You want something that provides a great feel and is lightweight. The G-Force ones I had suck compared to the OMP gloves.
Shoes - I have G-Force ones. They have a nice feel and have head up well. Get the high top version.
Some other items:
Fire Suppression: I run a fire extinguisher. I would like to upgrade to a fire bottle and 4 nozzle system. I guess it depends on how safe you want to be. But that is another $600.
Underwear: I do suggest 2 sets of Nomex underwear. I have the G-Force version and they have held up well. You have a clean set for Saturday and then one for Sunday. They help keep the suit clean and dry. Plus they get you one more additional second of protection.
Socks: You need nomex socks. Get 2 or 3 pair.
Cool Shirt: The shirt is $150. Us CMC guys cobble together the cooler for under $50.
Kill Switch: Do not go cheap! Get the Longacre that kills the ignition and alternator.
Steering Wheel: I have a Grant. It is ok. Has a good feel, but the construction is a little sloppy. You will want the quick disconnect too.
Roll Cage padding...it adds up quick.
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Jim Pastorius
2008 Silverado VortecMax
1992 Camaro
CMC#92
2002 BMW R1150R
2009 3rd Place CMC Mid-Atlantic Championship
2009 CMC Hyperfest Winner