While they won't do 'upright', I used to use Dean Markley Blue Steels... Great strings for the Jack... When I got mine back a few weeks ago, it was still wearing the Markley's that it had when I traded it, (after four years, they still sounded decent!!)
It's wearing Chromes now and those will be staying for quite some time...
For upright thump, try some LaBella Tapewounds...
-robert
Just saw this...
The Comprehensive List of Black Nylon Tapewound Strings!!!