<p>Lighten your load for mountaineering, try a g-series, g-16 or whatever the current one is, or a g1x for larger sensor. I don't go anywhere I need a rope, but you'd be surprised how having <em>one</em> camera <em>without</em> interchangeable lenses is freeing on outdoor or vacation adventures (I use slrs and mft with interchangeable lenses) . </p>
<p>With respect to your slr, any modern Canon will suffice, if you're happy with the rebel series stick with that, but it's not an elementary question if you're considering xxd or 7d etc. I find the equipment review section on fredmiranda.com helpful and lots of threads here. Tom</p>