Video card

I am building a simulator cockpit loosely based on the Bell 206.
I am sticking to helicopters as this has been my main interest for
many years.
In completing my computer to be dedicated to this, do I need to go
with a very deluxe video card as speed will not be a factor but flight
at 5000 to 9000 feet will be the norm. I also plan on doing a lot of
mountain flying as there is nothing more fum than swinging around
mountains flying through the valleys.
I also plan on simulating EMS flights with landings at undeveloped
sites as well as hospital helipads. Nothing puts more hair on your
head than a touchdown at a rooftop helipad!
Any information will be appreciated.
Also, my son is now in college taking 3D computer programming so he
can work in the movie industry. He promises to do some aircraft for me
in gmax. His work, so far, is extremely realistic. I might talk him in
to doing a side line for FS2004.

Fred Mahone