@ Shantia - Yep, Corel Painter can pretty much blow PS out of the water - if you can get used to it. Which I didn't. I mean, I am fine with it, but somehow PS grew on me, and I never really got into Painter. That being said, Painter is significantly cheaper than PS...
I never calibrated my pen... O_o Works just fine, though... No lag, no nothing.
Not sure if my Laptop is based on N-trig. It's fairly new, though, so it might be. If I can figure out what sort of stylus would work with my computer, I might order one.
Give Corel Painter a shot. It is the closest thing to natural media on a computer
You might really like it, and then your pressure sensitivity issues will be dealt with