What values of resistor and capacitor to use for AVR reset pin isolation?
Atmel AVR042: AVR Hardware Design Considerations tell us that the capacitor on the reset pin is not necessary. Personally I think it's overkill. There is no reason for you to continue making dozens of AVR circuits, each and every one with that redundant capacitor.

As for the reset pullup resistor:


  The reset line has an internal pull-up resistor, but if the
  environment is noisy it can be  insufficient and reset can therefore
  occur sporadically. Refer to datasheet for value of  pull-up resistor
  on specific devices.  Connecting the RESET so that it is possible to
  enter both high-voltage programming  and ordinary low level reset can
  be achieved by applying a pull-up resistor to the  RESET line. This
  pull-up resistor makes sure that reset does not go low unintended. 
  The pull-up resistor can in theory be of any size, but if the
  Atmel®AVR® should be  programmed from e.g. STK500/AVRISP the pull-up
  should not be so strong that the  programmer cannot activate RESET by
  draw the RESET line low. The recommended  pull-up resistor is 4.7kΩ or
  larger when using STK500 for programming. For  debugWIRE to function
  properly, the pull-up must not be smaller than 10kΩ.


If you take a look at professional products that incorporate the AVR micros, such as the Arduino, its numerous clones, dozens of dev kits, you'll find that most use a 4.7kΩ or 10kΩ resistor. 

And particularily for your ATtiny13, its datasheet specifies that the pullup should ideally range [20kΩ, 80kΩ].