I'm debating that one also, but when looking at the base price without camera, it may be doable. I'm just weighing all of the hardware and software mods which make this a whole different beast. The sticker price for a newer ST16S and the H520 less the camera may be worth it for entry level assuming you already own an H.
I do want to wait though to see if the H520 truly lives up to the hype. But now that I see it, $2k for the base without the camera is a bit steep. I'm betting on it coming down in time.