What are you looking to accomplish? Are you planning on selling them? Personally, I wouldn't grade them.
To answer the questions you listed in the poll... The "rare" 1969-S you are referring to is the proof version. Proofs have a different process of manufacture and therefore have a different appearance. The proof coin is valued about $1 in gem condition. The business strike version (made for circulation) is valued about $0.50 in grade mint state 65. This coin is common and can be found in abundance on eBay. It lists for sale at about $1.50 on average. It is usually listed for a little more than its value to cover costs.
1. No, you will pay more for the grading than these are worth. 2. Please do not use all CAPS, it's considered yelling.
If you could get a bunch 66's from that era or a 67, then yes. Problem is, that is not a 66 and may even go 64 due to the luster on the reverse. BTW 66's can go for $100 and 67's are way more.