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Do the top-of-the-line shafts, like graffalloy et al, come in something between a stiff and a regular stiffness? Does this stiffness have a name? Would a 100-105 driver swing speed be a candidate for the intermediate stiffness?

Rifle / Project X have a 5.5 which I've used and from what I was specified for my swing simular to yours.

Every swing is unique and ss alone can't determine an appropriate flex all the time...that being said, if you are between flexes, take the lower flex shaft and tip it...should put you in that 'tweener range...

Some shafts come in what is called Firm flex. It's between R and S flex. Problem is not all S flex shafts are the same stiffness, so a R flex in one shaft may be a S flex in another. This is one reason it's so hard to know what flex will work the best. That said, I'd think a S flex would work for you at 100 -105. If you have really nice smooth swing, an R flex might also work well. Best thing to do is hit some balls on a good launch monitor and see what works for YOU. If I was building you a driver, I think I'd use an S flex shaft, and align it in the head so it plays soft. Meaning I"d install the shaft with the NBP toward the target, rather than the spine toward the target.
A second option would be to use an R flex shaft and install it with the spine toward the target, which would make it play firmer. Either method should fit your swing pretty well.

Thanks All. I hadn't really understood Spine vs. NBP alignment til now. I believe the new Titliest shaft/head system we have at the club has the cabability to align either way. The head clamps to each shaft for trials. I have a question in for my pro if he knows how to determine the spine alignment so that we can fit the heads to either/or. I saw one site showing a laser pointer combined with a shaft weight and a rotating shft - is this the standard method?

I think the system will allow me to hit 8-10 different shafts in Spine and NBP positions. I'll try this first to see if I feel the difference and then maybe try the tipping too. Not up on this, but will get help. Thanks much.

The laser pointer and shaft weight with rotating shaft, would be for FLO alignment. This is an excellent way to align a shaft, But FIRST, you need to do a spine alignment to find the spine or NBP. Then you do the FLO alignment to fine tune the spine alignment.