Animations
On what it takes to output 4K computer graphics for film, IMHO you
need to start in the $150,000 to $500,000 price range, for minimum
configs, then you need the operating knowledge to produce the work.
You're not going to find this type of hardware or knowledge in the low
range of the CGI.
If you're really interested, you should probably start by locating
someone locally who is running a four perf studio enviroment. I just
saw a piece that was done on a standard four perf Polaroid
environment with custom triggering handles, and it looked pretty
nice. Technically the output can be sequenced with less than $20,000
worth of hardware (not including the computer equipment) but it takes
a deep understanding of the mechanics and elctronic aspects.