Hi there.
Thank you for contacting Klipsch! Our sincerest apologies for the extremely delayed response, we've been experiencing substantial traffic increases.
You may use the speakers with the built in stand, they are designed to be angled upward a little so they reach your listening perspective properly.
Arranging Speakers for Best Sound
this article could be helpful as well.
As far as amps go - there are many great amps out there, tubes and solid state, our speakers work well with either, they are extremely efficient and do not require much power and sound good with most amps including integrated AVR's That being said, a high end amplifier could make a big difference in overall experience. Tube style amps are well regarded in audiophile community but there are many great sounding options that are solid state as well.
Talk to your favorite hi-fi dealer for more specific recommendations.
Thank you.