Casio specializes in digital watches. Casio's most popular models are the "Baby-G" and "G- Shock" models. If you need a watch that can withstand everything you do, then try a Baby-G or a G-Shock. Casio also makes digital calculator watches. Prices for Casios are absurdly low: they start at $15 or so for simple analog watches, and around $40 - $50 for G-Shocks and Baby Gs.

Believe it or not, there is actually a G Shock Forum, which you can find here. One of my favorite watch sites is the Poor Man's Watch Forum, where you will find friendly folks engaged in discussing inexpensive watches from a variety of brands.