First of all i want to thank the dolphin team for making such a great emulator. 
Now, the questions -
1) Are my specs enough to run dolphin on full speed (720p or 1080p?)?
If not, then what should i upgrade & to what?
2) If i want to play Skyward Sword, should i buy a Wii Motion Plus controller?

Now, the questions -
1) Are my specs enough to run dolphin on full speed (720p or 1080p?)?
If not, then what should i upgrade & to what?
2) If i want to play Skyward Sword, should i buy a Wii Motion Plus controller?