Upload & Sell: On
Welcome to the forum! You have a decent budget and you'll get plenty of recommendations here. The high-end tripod models are made by Gitzo and Really Right Stuff (RRS) and both manufacturers tout their "professional" users. Down from there are many good value brands, the most popular here are seemingly Feisol and Induro, you should take a look at those.
Get a ballhead that uses the Arca-Swiss type of connection system which is very widely used. The Manfrotto heads are not well reviewed and also use a proprietary connection that many Manfrotto head users have replaced (at some cost). Buy an A-S type head from the get go. Photo Clam, Sunwayfoto and Sirui make well regarded heads.
An L-bracket is the quickest landscape/portrait switch, RRS make quality L-brackets that have an index mark in both orientations so you can center the body's sensor immediately as most clamps also have a center index mark. See if you can get a used one for your camera body, they're quite pricey.