Oh forgot to make another recommendation....
For under $150 you can get a Manfrotto 3001 ( come in black, silver, flat green... I'd go green just to be different ) AND a non-pro head ( ball which is my preference, or 3 way ). As I said, its still relatively light for a full tripod ( 3.9 lbs ). Many full tripods weight in at over 8 lbs. This tripod should serve you well for years and be ok on day trips. Now that you have a tripod, you can start saving again for my next recommendation.
For your extended backpack trips that require less bulk and less weight, have you ever considered a sturdy monopod? Some are sturdy enough to double as a good walking stick. I don't own a monopod ( yet ) but I've played with these in the store and they seem to fit a variety of needs:
This one is neat as it can stand on its own ( a little expensive though ):
http://www.bogenimaging.us/product/templates/templates.php3?sectionid=14&itemid=1815
only weighs in at 2.4 lbs.
or this one ( retails for 65 bucks ):
http://www.bogenimaging.us/product/templates/templates.php3?sectionid=14&itemid=1812
With a monopod, pay attention to the locking mechanisms. Especially if you are thinking of using it as a walking stick too. Don't forget the head.
I personally wouldn't mess with carbon fibre monopods either. Thats unless you have some serious cash to burn.
Has anyone tried this tripod:
http://www.feisol.com/english/enconnect.htm
I've seen them on
ebay recently and for a lightweight full tripod, its not too bad. I would jump and try it out but I've already got my tripod.