There is little reason to go straight to the top of the price range, but get a nice one with a strong weight rated head. if it is rated for 10 or less pounds, skip it.
Check out dynatran tripods on ebay, they are good for around 100.00 and you can upgrade the head when you get into monster 30 pound lenses.
I have 3 tripods. I have a super light portable one, a super heavy studio one, and a middle one that mixes rock hard strength with portability.... as said above, consider your uses carefully. the bogen 3021 is highly recommended on forums, and my friend loves his, but i wasnt particularly impressed.