I may be missing something, but it sounds like a pen and paper would best meet your primary needs.
Personally, I use this for notes:
http://www.livescribe.com/en-us/smartpen/echo/
I can't read my own handwriting most of the time, so the audio recording is perfect for me, and it still let's me capture bullet points or diagrams in an easy, electronically accessible way.
And even with my bad handwriting, the character recognition software is good enough that I can usually search for what need.
ApK