In that case, you really shouldn't be spending $60 on a USED pack.
Do your research, find the bag that really and truly is going to do the maximum amount of your desired tasks (no one bag will do it all, no matter what the advertising copy says) and spend the money necessary to get that bag. It will cost you far less in the end to buy the right piece of gear first than to look for cheap alternatives that are never quite right and/or aren't built to really last.
Personally, I find this backpack to be as close to a "one bag for everything" option as any I've ever seen...
http://www.youtube.com/watch?v=1nM6wfjuirE
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