Look at the Manfrotto 488R2. It's a 'midi' size and weight. Has panning capability and adjustment compared to the old 3-axis is extremely fast.
Light, and it came with a plate. Generally on Arca-Swiss system the plate is extra (starting at $45). An extra plate for this R2 system is $15.
I highly recommend this combo: aluminum 190XPROB and 488R2.
