Hi adimatis:

I would be concern about the brands you posted, I have friends that DID owned those brands, they are VERY affordable, but their reliability/quality is another issue, I would listen to the brands/PAs advised by Gary besides the Yamaha EMX 212,312 or 512 either with the Club series speakers S112V/SM12V, etc. or the EV ZX1 90s, a very light weight and small footprint and an awesome sound, depending on your needs the EMXs vary in power and the 312 & 512 have compressors vs. the smaller 212, this type of PA may cost a little more, but is better quality and very reliable.