Heard the Mackie Thump twice, first at the demo room second someone using this for mobile works only 2 cabs no sub...for the money cant really go wrong with them plenty enough bass but can still benefit from another 2 subs if using for dance music
but for voices and background music it will do the job....unless you can get some second hand RCF, FBT or EV within your budget then I probably consider them.
By the way, does it needs to be active? plastic cabs? ..... if you've got the rest of equipment (amps, mixer, etc) have you consider the DIY route....surely for 50K budget Sir Jojo can sort you something out