There will be lots of opinions. The prevailing ones, based on discussions with contesters, who are probably the most demanding of all HF operators, seem to indicate:
Ten-Tec Omni VI+
Yaesu FT-1000MP Mark V
You might want to review the "in depth" technical reviews on these rigs, available for download from the "members only" section of the ARRL website:http://www.arrl.org/members-only/prodreview/
The full-length technical reports are long .pdf files that take a while to download, but are complete lab test reports that seem devoid of opinion, and focus only on actual test results, and thus are scientific.
If you have an older TS-950SD, the SDX with DSP is definitely an improvement, one that's noticeable as soon as you connect an antenna. I love the other rigs on the list above, as well. The Omni VI+ is eerily quiet, signals just pop out of nowhere, but presents itself to the user as a remarkable receiver.
73 de Steve WB2WIK/6