To find out what threading you need, look at teh edge of your bb's on both the fixed and adjustable sides. There should be something somewhere like 1.375 x 24, 35 x 1, or 36 x 24 (I think it's 24). Those are respectively English, French (the Peugeot MIGHT have this, but it's probably too new), and Italian. There could also be The next thing you need to know is the necessary spindle length. If you are not going to change teh crankset, then pull off the crank arms left and right, and measure the spindle from end to end. You need to measure this to 1 mm accuracy, preferably with a metric ruler, and if you have a metric dial or digital caliper, that is the best.
With these numbers and the spindle style (square, Octalink, ISIS, whatever) you can buy new ones, at least with the help of the LBS, and possibly on-line. I usually find the LBS price is less than on-line, once shipping is factored in.
As far as brands, the conservative and simplest approach would be to just buy what you already have.
Last edited by Road Fan; 11-18-09 at 02:08 PM.