Which ever one you think is the best would be the best for you.
most of them all lead to viruses, but second life is fun but mostly the safer and most fun 1 is the Sims 2 or Sims 3 ( Sims2 is more fun) :):):)
In my opinion, i think my sims agents is the most fun.
Sims 2 Castaway is very fun. That is my favorite.
The sims 3
Yes you do, you need it to play on any of the sims 2 PC games
wizard101 is a great game for all ages and Sims is fun too.
most sims 2 games are about $20 but I have had a sale that they were all for $10
pets
definetly meez or habbo or all the sims games you should try them
Farming-Simulator 2009
There are a number of websites offering free Sims 3 games to play online. Puff Games and The Sims 3 are two websites where a person may play these fun games for free.
It depends what you mean, if it is the most fun then sims three definitely. But if you mean healthy for your computer then sims one.