does it have to be multi colour or single colour?
based on the info you give, even the i-trust controller is more than enough
moreover, it seems that you don't need high power
so, get a green (532nm) ttl modulated laser, around 50mw (cost around 50-80 usd)
get the i-trust controller (cost around 100-130 usd)
get a set of cheap galvos (cost around 100-150 usd)
spend a bit more on an enclosure and switches, cables, misc hardware
so, you have a low power, single colour laser projector for less than 350usd)
"its called character briggs..."