I would say Cube3 is the best bang for your buck and it's taught by the master that pretty much started the whole rubix cube magic craze. Rubicon looks cool and would be good for my presentations but it's just way too expensive in order for me to justify purchasing it.
Cube 3 is an awesome project by Steven Brundage. Also, look up Steven Brundage's performances on America's Got Talent for some other ideas and maybe get inspired to create your own.
If you need some speed cubes, I recommend the Shengshou Aurora which is the one I think Steven uses.
Hope this helps and that the show is awesome!