Looks fantastic! I was a web designer in my last career, and I've seen my share of bad sites out there. Yours isn't one of them. It's classy, welcoming, well organized, and easy to navigate. The text is great: a warm personality really comes through. Even if I didn't know you from the forum, I'd feel very comfortable doing business with you just from the tone that your site projects.
I agree with McJ that you've hit a great niche here. Most of us are players who want real, playable drums at reasonable prices. As you point out, those can be hard to find locally on craigslist, and eBay is hit & miss. Here in Toronto, there used to be a great store that catered to that niche -- vintage drums, keys and guitars, meant for players, for a fair price. The internet killed that business a few years back, but nothing has filled the gap that was left. I'm sure it's the same in other cities. Your site hits the spot.
The only thing I'll disagree with McJ on is the advice to justify your text. It's a personal thing, but my grade eight teacher drilled into us that we should not justify our text if we didn't want to lose marks. (He was brilliant, but a bit neurotic about some things.) Since then, I've never liked the look of justified text.
Best of luck with the business! I think it's really come along at just the right time.