I've have been gearing up to buying a new set of wheels and tyres for a while now, and i have narrowed down the selection to either 13 X6 Revolutions or 13 X 6 Weller Motorsport wheels. At the moment I have 13 X 7" Performance minilight style things with bold tyres (blasted 286 cam!

no matter what i will be shodding them in yoko A539's or a038's if i can afford them.
so the question is which are better from a performance/ competition point of view? basically which will be lighter and by how much? I know the weller is steel but im wondering if there is much in it (if any). Or is there another 13" wheel that is light and not overly expensive?
please dont tell me about performance and going for 10"ers- I have big costly brakes that i am not going to change! besides i like 13"

apart from the 10" thing any advice, or comments will be appreciated.
thanks.