A rating of 30 watts per channel is on the shy side. You'll get more punch with 50 to 100 watts. But in the hi-fi world a speaker is the only thing that makes the sound. Don't scrimp on speakers. You don't need to spend a lot of money, but you should always buy speakers that go about their business in a serious way.
Bad speakers are sometimes easy to spot.
They weigh about as much as Madonna's costumes and sound like a chipmunk on steroids. Even if speakers are beefy, you can get a pair of turkeys if you're not careful. Brand names you can trust include Boston Acoustics, AR, Advent, Bose and Cambridge Research. The ones from Bose cost more than they should, so look for sales if you're considering them. Small speakers can often sound just as good as large ones, so don't assume that bigger is better.