Yo Marshall! I have good news and bad news. Good news- any PA you get is better than what you got right now. Bad news- Rock N' Roll gear costs money, quite a bit of it. I like the suggestion above about using powered speaker enclosures. I like Eon, they usually don't blow up-usually. Look for used Peaveys or whatever. A bigass acoustic amp, 200 Watts or more can be a good start, because it'll be useful later, when you have a real PA. I like
SWR California Blonde for that. It already has a mic input, and some balls.
When it comes to a PA, there's only a few basic arrangements with countless variations. This is a partial list:
1. Unpowered mixer > Power Amp (s) > speaker cabs
> monitors
2. Powered mixer > speaker cab(s)
> monitors
Some of these are sold as kits, sometimes with mics and stands. Hell, I sold the 2 Fender mics (I think they were re-badged AKG) that came with my Fender PD250 Passport on ebay for $90! There's $90 off on a small PA. It's a portable PA which works for a solo act, and barely has the balls to do vocals with a small band.
3. Individual customized arrays- (Beaucoup bucks) as in BOSE's revolutionary
personal amplification system. This is weird and expensive. I can tell you, 10 of these rock, and should, at $2,000 or so apiece, with the subwoofer. I think it will be a marketing flop because the people who need it (Marshall) can't afford it, and the people who could use it (club owners) won't take a chance on it.
4. Individual mic'd amps/direct boxes > digital mixer from Hell > computer from Hell > PA from Hell - also out of the price range currently under discussion.
My advice is to start with small good quality powered enclosures or a small PA- check Fender, Carvin. They will be useful as monitors later, when you upgrade, and will still be good for small gigs. I would steer you away from the Kustom. It's cheap for a reason. Make sure you have the cabability to add at least one monitor later, 2 would be better. Hope some of this helps.-Richie