Welcome to the forum!
It's good to research and ask around, like you're doing. It's also good, IMO, to just try out what you have and determine if it works for you. I say hook them up to your current receiver and decide for yourself if they sound good to you. If you have access to a more powerful receiver (such as a friend's), you could then see if there's any meaningful difference to you.
Most of the time, people are using less than 1 W to power their speakers. Sometimes, much less than that. Higher-power amplifiers often provide better transient performance by being able to provide higher peak power levels than lower powered amps, and that's where you might notice a difference - especially at high volume levels. So, you certainly might notice an improvement with a better receiver and/or amp, but you might find that you're perfectly happy with what you have now.