My understanding is that right now, there are only five laptops with IPS screens:
Thinkpad X220 (12.5" 1366x768)
Dell Precision M4600 (15.6" 1920x1080)
Dell Precision M6600 (17.3" 1920x1080)
HP Elitebook 8560w (15.6" 1920x1080)
HP Elitebook 8760w (17.3" 1920x1080).
- 1400x1050 or 1440x900 or 1600x900 or higher
This requirement rules out the X220.
- 14" or less. The lower the merrier
This rules out the other four IPS laptops.
- 2kg or less (could be 2.3 but I'd prefer not 2.8kg that the A21p with 3 spindles weighed)
Among the four Dell and HP laptops, the lightest is the Precision M4600, which "starts at" 2.79 kg according to Dell. I am almost certain that "starts at" means with the optical drive removed, assuming it can be removed.
Actually X300 doesn't have a bad screen...What is the screen on T420s? I saw one HP with 1600x900 and while it was not IPS it wasn't that bad.
It sounds like you can tolerate pretty lousy screens. As I said above, if you insist on IPS, none of the currently available laptops would work for you. So, perhaps you should relax your requirement and settle for a non-IPS laptop.
Should I just look for another pristine X61T (I'd rather have the tablet than X61 with SXGA+).
This is entirely up to you.
Should I get T60p and max it with 64-bit CPU?
The T60p can't use more than 3GB of RAM, even with a 64-bit CPU.
I'm also open to alternative makers but would not like HP or Dell.
Why not? Are you familiar with the HP Elitebooks and Dell Precisions? I frequent the Notebookreview.com forum and over there, many people who have extensive experience with both Thinkpads and the Elitebooks rank the Elitebooks above most Thinkpads. They also rank the Precisions very high. Don't confuse HP's and Dell's business-class laptops with their consumer-class garbage.
What about macs? Which have more than 1366x768?
The 13.3" Macbook Air has 1440x900. The 15.4" Macbook Pro has a 1680x1080 option although the default is 1440x900. The 17.0" Macbook Pro has 1920x1200 -- it's probably the only laptop that still uses this perfect resolution.