I think If it was me, I'd get a computer that cost about $3000 as to not spend too much on stuff that's going to become obsolete super fast.
Get a really nice CRT for $600-ish
For connecting to the computer,
Get a really nice projector for $3000-ish
Get a sound system for it for $3000-ish
I'd rather have that for around $10,000 than spending the whole amount on the computer itself.
Of course if funds really are unlimited, get a $10,000 computer too and then spend 10 times as much on the projector and sound system too.
If you want to blow your money away, it's a lot easier to do it in HT equipment.