I used to be into the punk and h/c scene in nyc and your photos reminded me of all the awesomeness. (If I was into photography at the time, I think I would've been the first person to spill beer on my camera.)
Don't stress out too much about the quality of film scans. Scanning 35mm on a flatbed will not yield the best results: it exacerbates grain and will not capture the full latitude of the detail and tones in the film. Just get the scans as best you can for web display and work on them further in photoshop with curves manipulations and burning/dodging masking techniques. Scannning prints, for me, is just as disappointing. Never beats seeing a good print in person.
Definately get a better website without annoying adds and better layout. Try flickr before you spend money on webhosting. They now have an option where you can view the photos on black and go through them as a slideshow.
As for a print portfolio, 17 is the magic number and don't go smaller than 11x14. Get a good quality case--a black leather book with sleeves or black clam shell box if you decide not to put the prints in sleeves. Have extra prints for when you need to replace those that get worn out.
My thoughts on viewing your portfolio was that it was much more than just concert photography. It does seem like you are documenting the scene, the emotion, the characters. The most sucessful photos are the ones where there is no distinct line between crowd and band. They merge with each other, feed off each other's energy and anger and exhilaration.
Also have you thought about doing more people shots in addition to the show-centered stuff? I like the photo of the guy with the dog. Maybe adding environmental portraits or other real life scenes will add more of a narrative thread to the series with the show/music as your core foundation.