Amp Choices
There are lots of brands for amplifiers out there. How much are you looking to spend, & what kind of wattage do you want?
I always recommend 200wpc for tower speakers. This will bring them to life like you wouldn't believe. (I know that the naysayers on here disagree)

Since you have bookshelves you could probably be happy with 150wpc.
If you have an audio store nearby, take some of your favorite music & go demo some amps.
I have owned Rotel, Parasound, Outlaw & now Sunfire amps. There is also Nad, Adcom, B&K, etc. I'm sure you can find something that will make you happy.
