I want to get one that will last and stand up to the elements (rain and sun). I'm hearing that wired is better except for asthetics.

I just want speedo and trip meter anything more is basically clutter.

I see one at walmart, a bell, but it has calories counting and stuff I dont need, but can deal with it if its worth not having to order online.

But out of these two, whatcha think?

REI has a Velo 5 for $26 shipped

Nashbar has a Sigma BC-1606L

Or is the Bell at WM just as good for $15
I'm new to road bikes and y'all steered me straight so far.

Also, ease of installation is important as I don't know what Im doing besides attaching a sensor to a wheel.