It's been a while since I took a web design class, so my first couple of comments may be outdated, but:
-You don't need to indent paragraphs on the web. Removing them will make your paragraphs more visually appealing. As it is, it's a little awkward, particularly the one-line paragraph on the main page.
-Generally, sans-serif fonts are easier to read on the web, while serif fonts are easier to read in print. It didn't bother me too much before, but now it makes the print look a bit busy.
Also, the entire site tends to refer to you as "they," which is fine, but it should be consistent. In the gallery page for the wenge guitar, you say "One very accomplished player I know..." I think removing the "I know" would bring it in line with the rest of the site. Nit-picky, I know!
The welcome heading is off-center, and is now closer to the navigation bar than the text. I would put it either in the center or the left, and place it closer to the text.
I like the pic you chose to leave, since the color ties in with the color of your logo (although a shot of the front of one of the bodies may be more appropriate, since I think you want a whole guitar on the title page). However, I would put it to the left of the text. That's just me, though.
And a big +1 to getting rid of the splash page, or at the very least change the link on the logo so that it directs you to the main page rather than back to the splash page.
On the whole, I think you're 90% of the way to having a clean, professional looking site. Good luck!