For open road racing, you may want to consider a suit that meets the sfi 10 standard, rather than the typical sfi 5 standard.
In an open road race, it can take quite a while for help to arrive when compared with racing at a track. Having a bit of extra protection is not a bad idea.
You may want to look into a CarbonX suit. CarbonX is significantly more heat resistant than Nomex. CarbonX is difficult to find in a suit, but Simpson and several other companies make CarbonX underwear, headsocks, socks, and gloves.
I went with the full CarbonX suit option. I had a suit custom made by Design 500. Three layers, with an outer Nomex layer and two inner CarbonX layers. It is a terrific suit. I had them put some custom pockets on the inside to put cooling packs into to keep me cool on hot days.
I like both Oakley and Puma racing shoes. The Oakleys fit a little bit narrower than the Pumas.
Here are a few links you might find useful:
Speedware Motor Sports: (good source for many different racing suits, gloves, Oakley shoes, etc.)
http://www.speedwaremotorsports.com/clothing/
Homepage for the manufacturers of CarbonX cloth:
http://www.chapmaninnovations.com/products/carbonx.html
Homepage for Design 500 (the only place I know of to get a CarbonX driving suit.)
http://www.design500.com/
Ringer's Gloves homepage. Their double layer DriverX gloves (made from CarbonX are terrific. Comfortable, great dexterity.) They also make CarbonX underwear.
http://www.ringersgloves.com/driverx.asp
http://www.ringersgloves.com/underx_motor.asp
Safety supply south:
Cheapest place I've found for CarbonX underwear.
http://www.safetysupplysouth.com/Merchant2/merchant.mv?Screen=CTGY&Store_Code=SSS&Category_Code=CX
Simpson also makes CarbonX underwear:
http://www.simpsonraceproducts.com/products/product_detail.aspx?cat_id=275&prod_id=3888
PS: I think you will like open road racing. I did Sandhills last year, and am headed for Big Bend in 3 weeks. Also signed up for Sandhills again this year, and may go back to Big Bend in October. A real rush.