The Sinar looks the nicest, but I'm not sure which is for me.

I've already got one working 4x5 camera (Speed Graphic w 127/4.7 Ektar), so I want something a little more serious now.

Includes lenses with PC-sync, 645 or 6x7 back (already got an RB67 which I love) and 6x12cm back.

Which camera is the nicest to use and offers the largest range of movements?