Okay, let me try to give you some first ideas in regards to the selection process of tripod legs...!
1) As you may already have recognized, you will get here a wide range of hints, advices and recommendations. This means at the end of the day that the decision is solely up to you what to go for, as always.
2) You may be well advised to spend some time in the evaluation and selection process. Yes, your stated budget will enable you to get a high quality product that (hopefully) fulfills your requirements, but even with such a budget you still can make mistakes in the selection. From my own experience, just as an example: You can easily go for the most recommended product that promises (and also delivers) highest stability, but if you recognize at the end of the day you would have been better served with a more mobile solution, as your over the top stable tripod is simply too heavy and clumsy and therefore you let it sit in the shelf, you also have potentially wasted your money.
3) Really Right Stuff tripod legs, ball heads and other equipment have quite a good recommendation, no doubt. You will barely read any negative statement about the quality of their product, nevertheless you will find statements saying it's overpriced and depending on the specific requirements you can get products as good as theirs for less money. But if money is not an issue and "made in America" is priority no. 1 feel free to go for their products and you will barely be disappointed.
4) What is the reason that you look for tripod legs without a center column? The often seen argument that a tripod with center column is less stable than one without? While this statement (to be discussed and a topic for fight most likely into eternity) may have some truth included it needs also to be seen in a context. In easy words: Personally, considering my shooting conditions and my gear, I have not faced any situation where a tripod setup without center column would have served me better than my setup with center column. Other people, other equipment, other conditions... maybe there it is different. Keep in mind that really good tripod legs have the opportunity to remove the center column, a center column can be the last resort for additional height whenever needed and the center column also allows shorter folded length by utilizing the reverse folded length concept. Finally, there is quite some difference, mostly seen in the cost of the setup, how the center column and its locking mechanism is designed and that way supports stability or not.
5) Considering your height you will be a little more limited to find tripod legs that support your height than somebody somebody for example 1.70 m tall. Looking for tripod legs that enable you an ergonomic height and not having a center column will at least increase the folded length of the setup and that way make it less mobile.
6) Considering your actual gear the stated ball heads, while definitely good heads, at least for me are something like an overkill. Have you ever seen in reality for example RRS series 3 tripod legs with a mounted BH-55 ball head? No doubt, a great product and definitely stable, but maybe more so for some bigger gear considering camera and lens.
7) Finally, at least for the moment, there is also a fact that not everybody is aware of. There is not the one tripod setup that serves all purposes and requirements. You always will face a compromise at least between stability and mobility and that is a reason why a lot of people owe more than one setup.
So, as my personal "recommendation": Budget not an issue, as it sounds in your case, is a great thing. Therefore you can look into different solutions and brands that have a good reputation and are recommended. Brands to be named in here, even it's just my personal opinion: RRS, Gitzo and FLM (the brand I use). Other brands to be considered, they normally are always named also: Manfrotto, Sirui, Benro, Feisol, etc.
Most solutions that will give you sufficient stability and mobility for your existing equipment will also support a longer lens as stated from you as long as you know how to handle the setup. Just aiming for max. stability only makes sense as long as you will have the setup also with you, but reality shows that people finally get annoyed regarding weight and size and then either leave the gear at home or go for an additional setup. With some thinking upfront you can easily avoid such issues...!
Any questions left just let me know.
Herbert
