I have the 28-105 f/3.5-4.5 II USM lens, I use it on my film camera and now on my 10D. The first thing I noticed with this lens on the 10D is that I miss the wide end. I am now in the market for a 17-40 f/4L to recover the wide end. If I were to purchase the 28-105 again I would get the Canon 28-135 IS, for the IS feature. All that being said, I think the 28-105 or 28-135 would be a perfect starter lens for a Drebel. If you never had that 28mm wide angle you won't miss it as much. The 28-105/135 is a perfect gap lens for when you do fill in the wide end with a 12-24, 16-35, or 17-40.
I have a Lowepro Computrekker for my gear and I am pretty happy with it. It is basically a Mini-Trekker with a padded laptop sleeve in back. It has a flip out tripod holder, a huge front pocket, and an AW cover. I am currently carrying a 10D with 28-105 attached, 80-200 f/2.8L, 300 f/4L, Canon G2, and an EOS 3 body. Also I carry filters for the lenses(polarizers, 81a's, and split ND 1 and 3 stop, with adapter rings for the lenses). I have to do some arranging to find room for the future 17-40 f/4L and a 550ex. Right now what I have in the bag takes up a lot of the space of this bag. It is also very heavy fully loaded up. I find it nice though for an extended trip to have my laptop with for downloading and reviewing shots(ugh, more weight). On day trips I leave the laptop at home.
I don't see any reason to get the LCD protectors, I haven't had my 10D very long but I find the LCD is never really in the line of fire. I owned an S30 for a while, and the LCD did get scratched, but it really didn't hurt it, I still could see the info I wanted clearly.