Thankyou soo much for all of the suggestions everyone!
I really appreciate everyone's helpful comments!!!!!
I think i am going to go ahead with C.
It's simple, yet elegant and not too overwhelming for my hand.
I tried on one in the local jewerly store yesterday that we visited (just to try on similar rings so we'd have an idea of what we're into) that looked just like C- same size and everything- and it looked wonderful. It was simple, yet very pretty- i loved it!!!
I was worried about it "disappearing" under the size of the engagement ring- but it actually looked very good with it- so now that i tried it on i think that's the type i'm going to go with.
I wish i lived closer to the actual shop we're ordering it though so i could try on more of the ones i liked in person- but i'm in tennessee, and his family is in alabama- so there's just no way. So we did the best we could going to some local shops and trying on similar styles/rings and also looking online through the same catalogue that the store is going to order though. I feel pretty confident about C
He's also picked out the one he wants as well (and was able to try on almost an exact match in the local shop!) so thankfully that's taken care of. He wants Tungsten Carbide though, so that is the metal his will be made out of.
To answer some questions- yes, depending on the enhancer it can be resized and you can also have the enhancer welded together with the ring (Sounds ugly, but when done right can look good) to make it "all one" ring. I think i'm going to go with C though simply because it just looks a bit more classy to me and more simple.
Maybe someday down the road he'll get a second one to match for me to put on top of it- but if not that's ok too!
Since we've decided on C, would one of you wonderful Mods mind closing the poll?