Just because many people do something doesn't make it the smart thing to do....the speakers are the core of a sound system, not the electronics. Changing the entire setup for future upgrading is probably the better way to go. I'd use your system as is while I saved up for a significant change. YMMV.
I will second lovinthehd's opinion and advice: save your funds and get better speakers before you upgrade amplifiers. The highest percentage of what you actually hear comes from your speakers, not from other elements in your system. Upgrading amps when you have marginal speakers is usually a recipe for a disappointment upgrade.
I used this clothing analogy earlier in the week. I get to use it twice in one week.
Don't buy a $90 tie to put on a $20 shirt.
The shirt is the mainstay, don't adorn it with fluffy items that cost more than the main event.
If you want a real sound upgrade, start saving your funds for better speakers. It may take a while. But, you'll get a real upgrade in what you hear if you choose carefully