System - addict

I’m looking to upgrade my pa - my budget is about £1500 and I want to power a decent-ish size room e.g. not just a back room of a pub. Does anyone have any top tips and do’s and don’ts? The most affordable option looks like the ‘Mackie’ type 2 way systems but I’m not sure whether I’m better off going for something secondhand where I might get more bang for my buck…any informed thoughts welcome!