I have my ERA on the road 4 years now, 6000 miles. I have driven it from high 90 degree temps down to low teens and never once did I wish it had heated seats. I did get the glove box and side pockets and im glad I did. I do wish I got the larger
oil cooler, just for looks. I didnt think it was worth the extra money back then. Also, I would get the harness mount for the roll bar and the clip on shoulder harness. . Mine is bolted to the bulkhead behind the seat and to change it now I would have to recarpet the back because the carpet is crushed. Its all personal choices that you must make so you are happy with your car.
Im curious why nobody ever mentions the richmond when they talk of 5 speeds. Its a true 5 speed with 5th gear 1-1. I never did the math but how about it with a 3.08 gear. Has a low 1st and would cruise nice. There must be a reason though.