How to: This kinds of melodys

[ds13]

Hi guys! I'm a bit lost when i want to make this kind of sounds:

start_
¡http://www.youtube.com/watch?v=Bj58-Ap80hI

00:49_
http://www.youtube.com/watch?v=_aTefVsYUWo

01:20_
http://www.youtube.com/watch?v=kZoOnZ7xokQ[/video

01:00_
http://www.youtube.com/watch?v=RIDkKEHHo84

03:16
http://www.youtube.com/watch?v=b6uAGwJGZpo

Which kind of synthesis or vst synth i need to learn, some topic about this here? or which are the basic tips to make this kind of sounds? I would like to buy fm8, but i don't know if this one is the best solution for this type of sounds.

Thx mates and keep rocking!