My T43P is nearing the end of its life - my it rest in peace.
You can't kill a T43. Only the battery dies.
Does the accelerated GRADD for Intel work with the Intel HD4000? (Doug you have an HD3000 - what is your experience?)
Panorama works well, but be sure to get a 1600x900 screen, The 1368x768 screen isn't that great. Acceleration is a moot point, nothing is accelerated any more. Panorama has a buffer that helps, and the machine speed makes up for the rest. SNAP will also work, but it is not accelerated, and doesn't have the buffer.
Suggestions on which PCIe Mini Card I should get that will work with GenMac?
None of them will work with GENMAC. It is most likely that Intel will be the first to be supported by MultiMac, when it is done (no ETA, yet). MultiMac works well with Intel, and Realtek, wired NICS.
Any other issues that should steer me to a different machine or I should be aware of?
I am happy with the Lenovo ThinkPad L530 (and my older T510), but it does have problems. Sound sort of woks, but not well (the T510 works with UniAud). Sound is pretty marginal on all laptops, unless you use external speakers anyway. The L530 has a UEFI BIOS, but that hasn't been a problem.
YMMV...