Well shoot $500 on a tripod will give you a very fine tripod. Unlike cameras/lenses there are a plethora of different brands all competing in this market, each with it's own quirks and goods/bads/uglys. I cannot recommend any stronger than to not go by blind faith of the internet on this purchase because in many ways, you may become as intimate with your tripod as part of your gear as the camera itself... But what I would do is run some searches, I can even do an initial search on adorama... search under your criteria... 60" check, carbon fiber or light weight aluminum... heavy load (the more the load, the more stable it should be)... and then print out your list and take it with you to the store... compare prices, compare tripods... they should have several out on display... find those particular models on your list (and even some that may not be on that list as long as it's meeting your criteria via specs). Hint... even if the tripod is not on display but in stock, if the camera store thinks theres a potential of a sale, they'll help you take out the tripod and test them... anything to get a sale. Lastly, there are 2 heights to consider... a height with a closed center column and a height with an extended column... ONLY USE THE CENTER COLUMN FOR EMERGENCY OH CRAP SITUATIONS.... you severely lose stability and do not rely on that to always be there for you. http://www.adorama.com/catalog.tpl?op=itemlist&cat1=Tripods&cat2=Tripod%20Legs%20%26%20Leg/Head%20Combos&cat3=Leg%20%26%20Head%20Combo%20for%20Still%20%26%20Video&Feature2=10%20To%2019.9%20Lbs&Feature3=60%22%20to%2072%22&Startat=61http://www.adorama.com/BGMT294A3327.htmlhttp://www.adorama.com/BGMT294A3324.html
This is a good generic lists of aluminums and carbons meeting your broad needs of 11 plus load weight and 60" tall min. They are head/leg combos but you can get more specific and better gear mixing and matching... I stand by my recommendations on heads earlier and already gave you those links but for legs $300 an under... http://www.adorama.com/catalog.tpl?op=itemlist&cat1=Tripods&cat2=Tripod%20Legs%20%26%20Leg/Head%20Combos&cat3=Tripod%20Legs%20for%20Still%20%26%20Video&Feature3=10%20to%2019.9%20Lbs&Feature4=60%22%20to%2072%22&Startat=1
flashpoint is adoramas house brand... you probably wont be able to test them at a local store but they are at a great value...http://www.adorama.com/GTMT8260.htmlhttp://www.adorama.com/SLP500DXLBK.html
I've used this one... true to description and light weight despite look.http://www.adorama.com/SLP723CF.htmlhttp://www.adorama.com/SLP823CF.html
Anyways heres some quick suggestions to look at (at the stores...) play with them and see what feels the best for you and your budget. Good luck once again.