Any issues I should be aware of?

Whats best?

I'd like a system that can also be tied in to a computor to display
videos, charts, ect.

I have dish satt service, do I need a TV? or just a screen?
I also need a DVD player to work with it.

The space I plan to install it measures 29X18X6 and is on the forward
bulkhead in the forward V berth, will slamming a wave or other
vibrations be an issue?

Any suggestions?

Joe