Buying first Tower Speakers and Amp

Hi - I'm about to buy Tower Speakers and an Amp for the first time. Basically, I want the music to sound decent and be moderately impressive to chicks and friends. But I'm not looking for the most expensive models, unless it's really the only option. What do I need to buy? What specs? Any flat out recommendations? Budget is flexible. My mechanic recommended this:

Infinity Wakeboard 6100m 150-Watt Tower Speaker and Amplifier Audio System with Talkback Microphone

thx.