Thanks for your inputs guys, capacitors, diodes, transistor amount, motor controller transistor, LEDs and I still prefer to keep 74LS47,74LS48 along with 595s and 164s shift registers, for very beginner user purposes.
Still out from my list keypads, LCDs, motors, relays ...
Here is the update http://goo.gl/Pz3op
More inputs still welcome, I believe the list is still grow and hope this will give a good clue for Arduino and Electronics hobbyst beginners, what they should prepare to start playing around with Arduino.