1000wrms should be good but don't over do it. i know someone who had a pair of 15s and messed it up with some serious power. he was playing a song with some low bass and the rubber surrounds just came off the basket.
the 15 type Rs sound good btw. gets really loud too.
type Rs work well both ported and sealed. i like sealed subs so i had them sealed. however i did have them ported at one time and it still sounded clean while getting extremely loud.
i really like the 15's the one i saw was in a ported box and was given 800rms and it sounded great. it was very clean while still being loud. the only thing i didnt like was the person who did it didnt put one of those clip wire holders in the box,(the ones you clip the speaker wire into and it goes through the other side to the subs.) he just drilled a hole in the box and ran the wire through. so you can hear air rushing. but besides that i loved the setup and the sub.