For the awl: I use an Osborne straight awl blade (1 3/4") that I bought from Springfield Leather, inserted into a peg awl haft, also from Springfield. It does well for me, but I did feel that it just wasn't sharp enough when I first bought it, so I sharpened it real good and now I just polish it. I have heard a lot of people on here say that Bob Douglas makes the best awl blades you can buy. I don't have one, so I can't tell you how they are or how much they cost. I do plan on trying to get my hands on one eventually though. As to your two requirements (versatile and simple), I don't think it can get more simple than than the one I'm using. As to versatile, I just can't get a clean stitch without it, and I use it when I stitch everything. I've been testing out using my awl blade in a drill press (turned off, of course) to keep my stitches straight on both sides of my project. I stacked up a couple sheets of cork to keep the blade from hitting the drill press table. So far it has worked well, but I've only tried it on one project.
For sharpening your edge beveler, I use the method that is shown here:
I have only sharpened one size of beveler so far, so I didn't glue the lace down like he does in the video, I just put jewelers rouge on a piece of lace, and hold it down tight to the table between my thumb and pointer finger and strop with short strokes (make sure you don't rotate the handle up or you'll mess up your edge, but he explains that in the video). I'll need to make a strop like he has in the video now that I have multiple sizes of bevelers, I just havn't gotten around to it yet.Hope this helps,
Ryan