The one basic issue with any of these kits is the lack of aftermarket stuff if you want to dress them up - 1/600 simply does not have as plentiful a number of offerings as 1/700 does. Aircraft, weapons, PE, decals, you name it and you can probably find it, somewhere, in 1/700. When you get into 1/600, 1/800 or one of the "box scales," though, your options get real limited, real quick.
Something to keep in mind if you don't like doing a lot of scratchbuilding.