A popular monitor amongst camera assistants, the VFM-058W from TVLogic has a full HD, 1920x1080 5.5" panel. All popular monitoring tools are standard - focus assist, exposure assist, etc.
The VFM-058W also cross converts signals between SDI and HDMI, so you can loop out between signal types.
Our VFM-058W hire kit includes a Noga cine arm for mounting, d-tap to mini-XLR power cable, a Sony L (or Canon LP-E6) battery plate and SDI cables to suit. We can also supply 2-pin Lemo to mini-XLR cables to power the monitor.