Was it a typo, that you meant the Cinema 30?
The X4800H and C40 are almost identical twins internally despite what some professional reviewers/Marantz marketing told us. The main difference is that only Marantz has the HDAMs that are hype, best it can do is do no harm. The C30 will do the job for you, but then you may as well get the X6800H that is again almost the same internally except the C30 has a marginally larger power supply and better heatsink/board layout, unless you can get the C30 for much less than $1000 (based on list price).