cfw doesnt have 7.x compatibility, but then neither does R4i....i would only suggest you use the 4.b2 of the R4 FW that doesnt have emunand (its pointless if you can only update to 6.x anyway).....basically the R4 is like a tiny bit more stable version of the CFW, pretty much identical game compatibility, but it doesnt let you use homebrew,....easier to set up though....but still imho pointless to own at this point
save the money and put it towards a gateway and just use the CFW for now while you wait