I'm looking for a tripod that's robust enough to support my 550D w/ battery grip with a 400mm F/5.6 lens. Can someone recommend a good one for me that's around $150 but sturdy enough to be used on the field, and light enough to carry for hours?

Many thanks!

Franco

I've done some research on my own, but not sure which one to pick :S
The following tripods seem pretty good for the price..
http://www.ebay.ca/itm/New-Camera-Pr...t_12448wt_1163
http://www.ebay.ca/itm/Pro-Carbon-Fi...ht_2643wt_1163