Rock and roll speakers?

Efficiency might be the key since it could keep the loudness happening with less opportunity for your amp to strain. If you really want to get loud, stop messing around with hifi speakers and buy a pair (plenty of used stuff in your price range) of the largest pro PA speakers you can find along with a powered 15" or 18" sub...and prepare to be asked to move out of the neighborhood. This will allow you to have an alternate career as a DJ where you can meet hot chicks with tats and nose rings.

Vandy's aren't for R&R. They're very very slow. I've always felt that they're only good for classical and vocals.

Here is the "What is the best HEAVY METAL speaker?" thread that Dweller was referring to.

I would recommend Cerwin Vega's, JBL's or Legacy.

Klipsch due have a hi boogie factor...probably due to their efficient nature... But they really due have an energetic, propulsive presentation... They can be very forward sounding...so if you are looking for depth/spacious sound not the most ideal...and vintage Klipsch fans are a loyal bunch...kg 4, chorus, forte etc can be had fairly affordable and resold for minimal loss if any...

If you have any local audio stores near where you live, I would just go and listen to what is out there. Take your favorite music with you and enjoy the experience. It is the best way to tell if you like what you hear.