I have the Accufab 75mm. I bought the TB and upperplenum. I have no complaints. I love em and I was able to tell the difference when i put em on. I've never heard any bad comments about them so far and you won't hear any from me. But there are many options out there. Just my .02
Get a 75mm, many dyno tests and companies have said the extra 5mm won't hurt you, even on a stock car. The extra 5mm leaves room for improvement over time if you decide to seriously start modding...