How 'bout:
"Congress shall raise no direct taxes of any sort, even when proportioned among the several states" and "Each senator shall be appointed by his state's legislature." I'm less certain about the second than the first, but I suspect that those favoring limited, local government will have a better chance of prevailing with the second provision.
By removing the election of Senators from the legislatures to the people, the Senate was changed from, within each State, a geographic division of powers to a demographic one. While the two-per-State Senate still makes little Rhody the equal to California, on the whole the 17th amendment turned the Senate over to the urban populace.
A shame.
The worst effect of the 17th amendment was to detach local representatives from their voters. People tend to care more about the national and Senate elections than those local. They'd care a whole lot more about the local elections if the choice of the Senator depended upon the outcome of the local, not the State-wide election.