The Meteor Elipscan is basically just a moving mirror that fits over the end of a Leko (or other light) While it will allow you to locate and move the fixture's beam, it hardly qualifies in my opinion as making the fixture intelligent. BTW, Rosco has a similar unit called the I-Cue.
When I think of an "Intelligent" fixture, I picture one that will allow you to move the beam AS WELL AS change the color of the beam, and possibly add gobos or alter the size of the beam.
The moving mirror units are great if you only need beam positioning. If you want to change colors or gobos or beam shape/size with those same elipsoidals, then you would need so many aftermarket accessories that it would be cheaper to just buy a real Intelligent fixture in the first place.
First you need to define what you want the lights to do. If all you want is beam positioning, then the moving mirror adapters will fit the bill. If you need large areas washed in colors that can also move, then a WASH type fixture is in order. If you want to projects gobos and patterns in different colors, then a SPOT type fixture is in order.
Next you need to figure out how bright you want the fixtures, how far will they throw, what other lights will they have to shine through, etc.
If you are looking to be able to use just a few fixtures for many special spot cues, then the moving mirror adapters like the I-Cue would fit the bill. If you want to add some sizzle and have a few moving beams with limited abilities, then an entry level unit (like a DJ size) might fit the bill. If you need a unit with many features and the ability to cut through a bright stage wash, then a pro unit is the answer.
As for control, most moving lights and dimmers today use a protocol called DMX. This signal can be used to tell dimmers to fade up or down, or have lights move their beam, change colors, gobos, etc. Most lighting consoles today output a DMX signal. If your school's current board does not have a DMX output, you would either need to buy or rent another console to control any moving lights.
Craig