Sonic Match

Where to begin...

Well, let's just get it out of the way: there's not going to be an appreciable, audible difference between any two amplifiers operating within spec. So get whatever has a reasonable amount of output power and suits your budget; ideally the less you spend the better. No point in spending a fortune on something incredibly expensive.

So basically, if your current amplifier has enough power, and can handle these speakers as a load, leave well enough alone - you won't gain anything but a larger credit statement at the end of the month.