Best expandable Arduino starter kit

Projects General Guidance
4

So I think I'm pretty set on getting that ARDX kit (when I get a bit more practical knowledge, I'll probably buy separate), now what I'm not sure of is whether or not I should get the Arduino ADK Mega or the Ardweeny kit.

I have a couple of questions before I make my decision:

  1. Will I be able to follow, for example, an Uno guide if I have an ADK Mega? (I'm guessing not always vice versa?)
  2. I am considering adding an Ethernet shield (or preferably a Wireless-N shield, if you guys say they're okay, not b/g -> will downgrade the network from n to b/g), so the Arduino receives its commands through the network. This is possible without running another server connected to the Arduino by USB, right?
    2a) If yes, Thoughts on this? WiFi Shield V2.2 for Arduino (802.11 b/g/n) - DFRobot
  3. Any suggestions on documentation for me to start with? (is there different documentation between the Uno or the ADK Mega, appart from the 'ADK' documentation from Google?)

Thanks again in advance.
-Marc