Honestly you can disreguard most rating on comp speakers. Most any, even cheaplly made comps can take 100 watts of clean power. With that being said the rsds should have no problem taking the power, and much more. As for the diamond hex's, I was not impressed by them, nor have I been with anything they have made quite honestly.
Can I ask why you are going with 5.25s instead of 6.5s. If your seeking some good midbass, i suggest you move on up to the 6.5s. I have never been a fan of 5.25s.
Well im not building a kick panel enclosure becuase in my grand prix there is already a stock location for a 5.25 in the kick panel and tweeter in the A pillar
Trying to keep my costs down, dont have too much money to work with
Well I personally will not be installing this stuff, Ive got no good tools and with work, not a lot of time. I'll have to get a price on mouting 6.5's in a 5.25 kick panel from a shop.