Got the RB67, kinda big for my hands though. Will try it out but seems like I will switch it for a Hasselblad 500C.
Well, try it out first. You can do great work with a 67.
There is no such thing as a small, light medium format camera. Even the Mamiya 7 is quite hefty.
But, as I mentioned earlier, you really should consider a Mamiya 645 if you want something nimbler. The 6 x 4.5 format is more versatile than the Hasselblad 6x6 and you will get a lot more lenses, prisms and accessories for your money with Mamiya. I really couldn't say that image quality is inferior either. The main difference apart from cost is that the Hasselblad camera has "The Look" according to some people. Plus you probably will be shooting Hasselblad without a prism, which means looking at an mirror image and doing hand-held metering. This is so much slower than just shooting with a Mamiya metered prism.
But if it is a Hasselblad that you crave, then you should go for it straight away, or you'll waste time and money in the upgrade cycle. But this seems like an open question to me.