the tripod I need costs closer to $600 :/, (backpacker)
Stability is #1, with most slr's you would be fine with a cheapo, but put a heavier lens on there and you will have shake. Now, 95% of people wouldnt tell to much of a dif pic to pic IMO, but if you want to take really sharp images, you cant have any shake, so you pay for high quality, compact, lightweight, etc just like everything else you buy.