I would assume that wood over concrete wouldn't change all that much as opposed to carpeting that would absorb more of the sound. I just finished installing my own bamboo floors throughout my house and although I was working over a wood subfloor, in my search for flooring I saw that there were options for "glue down" wood floors. These are all the engineered type wood floors and actually go down quite easily. Dave is right regarding it being a bit like a puzzle installing it, but I found that it certainly wasn't rocket science and the only tools I needed were a tape measure, a $50 jigsaw, a rented pneumatic floor nailer, and a hammer and nails for the last boards that had to be "face nailed" I was able to lay about 250 sf a day including cuts for floor vents etc. Since you are going over concrete and would be gluing it down I think it would be even easier and faster for you.
Check out Ifloors.com very reasonably priced (I took a break from audiogon to research floors for a month or so with the same obsessiveness that we all do with our audio gear) They have a wealth of info on the site.
Personally...I like the look of wood floors with throw rugs...after pulling up my old carpeting, I have to say that it was so gross underneath that I will NEVER have wall to wall carpeting in any house I own.
I think I probably rambled on more than answering your question...sorry about that.
Merry Xmas