I'm currently wearing a Casio G-Shock... but thinking of getting
a Casio G-Shock Frogman and Timex Flix Ironmen soon... 
wat kind of sports are you into?? unless you are heavily involved
in mountaineering or adventure racing where you need information
like altitute, pressure or temperature, otherwise there's no need
for a Casio Protrek.
Nevertheless, it's a great watch. From my point of view, much
better in it's price, durability and reliability compared to more
fancy stuff like Tissot T-Touch...
If you need watch for general sports that is durable, cheap and
provides you basic functions (stopwatch, EL light, countdown
etc...). Basic models of Casio G-Shock, Casio Baby-G, Casio PHYS
and some model of Timex would be good enough... If you need things
of a higher grade with better functions (heart rate monitor, auto
EL light etc...) Timex or Polar would be good 
