If you can up your budget by less than $100, you may want to consider a Feisol CT-3402 carbon fiber tripod topped with a Photoclam PC-36N ballhead (total stated price about $398 ). This is a very lightweight combination, which totals just a hair over three pounds and will easily hold your stated gear (and then some). The recommended aluminum Manfrotto/ballhead combo weighs in at nearly seven pounds, twice the weight of the Feisol. It all depends on how you're going to use the tripod. If you drive somewhere and just park, set up, and shoot the heavier tripod shouldn't be a problem. But if you primarily shoot landscapes, some hiking to and fro will be involved...in this case, the lighter carbon fiber setup would be to your advantage. Eventually, heavy tripods are more apt to get left behind.
The Feisol rig is just a little over your stated budget, but you'll have the advantage of lightweight carbon fiber as well as a tripod that will last you a long time. The Manfrotto will do the job, but eventually you'll want something lighter, especially if you start to carry extra lenses and other gear with you out in the field. The Feisol unit will save you the trouble of having to eventually upgrade. Just something to think about...