I HIGHLY suggest Jimmy Flintstone over R&R. Jimmys casting is atleast void of air bubbles and complete voids. R&R is completly aweful when it comes to casting quality, and your almost sure to have alot of air bubbles and most likely voids in the casting. Its truely unfortunate, because R&R has alot that all the other casters do not. If you have advanced skill, you will need all of it for the R&R. If it were me, id buy them both and use the JF body, and the R&R interior bucket (im sure that is a real mess too, but if that is all you have, then...)
Good luck, and please show and tell!!!