We need the floor area, take into consideration when it's full of noisy people for each person has a coefficient of absorption (like in theaters).
There are a lot of powered mixers on the market that would fit your budget and application. The EON clones are more of passive copies than counterfeits. The original EONs are bi-amped (gainclone amps), powered speakers (active) and they accept balanced inputs designed for mobile gears, auditorium setups, bars, etc. One good example that uses these EONs is Quiapo Church.
Unfortunately, EONs are relatively expensive, that's why I suggested a powered mixer that would power passive EON clones.