You know, you can go around and around forever and seek all the advice in the world, or you can buy something

Here's what it comes down to with powered speakers and a budget... you can buy a pair of used QSC K12s - which everyone seems to agree are the cat's azz - for probably around $500-600 each... or you can go new and one step down for a set of something like EV ZLX12P or Yamaha DXR10s - which are both great, but a cut below the K12s - in the $400 range new. Once you get below that you are into Altos, Behringers, Harbingers and Kustoms.... they are fine for what they are, will sound OK and may last but they are what they are. I have nothing against cheap stuff and I will admit to a major fondness for Kustom PA50s - which for 80 bucks new are the steal of a lifetime - but I treat them as what they are... 79.99 speakers that have their purpose.
In my classic rock band we started off with Behringers as mains and the PA50s as monitors. Then we upgraded to Yorkville YX15P mains, then the EV ZLX12Ps as mains and to where we are now, with K12s as mains (got 'em used) and our former mains the QSC ZLX12Ps as monitors. I'd use the ZLXs again as mains in a heartbeat... they're not quite the K12s, but they are in the same ballpark and sound great.
The point is we went through PA improvements pretty much as the band itself developed and once we got to a certain point decided we were committed enough to get a system that could play anywhere. Never lost a cent along the way because, other than the ZLX12Ps, we bought everything used and sold them for at least what we originally paid. Oh and we kept the PA50s