The Galaxy Note 10.1 still is the best option if you want to note take as it uses the highly desired Wacom digitizer, they say it's the closes you can get to writing on a pen. The N-Trig, which my Thinkpad Tablet uses is of lower quality vs Wacom, but for my needs/usage I like it. Plus, it's using a quad core Exynos cpu, which is one of the fastest ARM based cpus on the market. From the reviews I read, it seems like all the Note 10.1 needs is root and stock Android rom, not one skinned up by Samsung. Plus, the Samsung has a pen silo, which means you don't really have to worry about forgetting your pen, like one would with the iPad, or tablet not pen enabled.
On the other hand the Asus Transformer Infinity comes with a high res, IPS+ display. Not as high as the iPad, but it is essentially fully HD. It's using the latest Tegra 3 cpu, but I think ram is stuck at 1gb vs some of the even newer devices, which offer 2gb of ram. It offers no pen, so you are stuck using your fingers or finding out, which capacitive stylus works the best with that device, or spend the cash on the keyboard dock.
If you are receptive/don't mind it, Wind'ohs 8 tablet with that disgusting, never be touched Atom CPU, and digitizer(wacom in most cases), will start a little more than many of the higher end Android tablet at around $600 for a 64gb SSD model and maybe with the optional pen.