Any suggestion for the best screen recorder in Mac between these ones or other ones?:iShowU,HD and HD Pro,Screenflow,Screenium,Jig from TechSmith,etc...
And of course to not kill the system,resourceless most?

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System specs: Desktop PC,
Nvidia GeForce 210,1GB,GDDR3,PCI-E 16x gpu,
6GB Ram(4x2GB),DDR3,1333mhz,
Ubuntu 12.10 x86_64/Windows 8 Pro x64/Mountain Lion 10.8.2,
Intel Core i3 3.1Ghz, cpu,
Gigabyte H61MA-D3V motherboard.