SEVEN pages to answer the question "What kind of speakers should I buy?'"
Good Lord!
I saved the BEST Answer for last!
...You want powered Active speakers.
The Answer is simply ALTO Powered Speakers, specifically Alto TS312. $600/pair, and you are good to go. Purchase either 25 ft IEC power cables, OR a couple of black extension cables that are 20 feet long so you can extend them out when you want to. Add a Alto TS2 series Sub for $499 or less to go with these speakers, and you are good to go. Full sound system for under $1,200, and will sound great!
Don't listen to any Haters on here. They are jealous they spent more money on speakers, and don't want to admit that these speakers sound superb.
....Now...if you have a lot more money to spend, and want to SPLURGE on this. Here is Option 2: ...Go with QSC K12.2 ...Can't go wrong with them. They will last super long. OR...Yamaha DXR MKII. I prefer Yamaha myself, but QSC is like a industry standard in regard to their name and reputation with powered speakers. This option will cost you $1,500+ ...Add a Sub from either brand name, and you are looking at $2300+
IF you really have a lot of money to spend, and want the line array look. Go with Bose L1 model 2 along with Bose Subs. Older speakers, but still sounds solid, and last forever. DOn't forget the Bose MIxer as well for optimum sound. Will set you back $5,000+ or whatever, but you will be in the exclusive BOSE Club, and have a sound system that will last a dozen years or more no problem.