What is the best software to use to jailbreak my iPhone?

I have an iPhone 3GS with iOS 6.0.1.
My warranty is up and I wanna jailbreak it.
I tried limera1n, but it froze & left my iPhone in recovery mode.
Q1: Which jailbreaking software would you most suggest?
Q2: Does it require me to download an IPSW file of the iOS, or can I jailbreak on said software without it?

Use Redsn0w. It is completely automatic. Literally click-n-go process. Here is the website:

http://www.redmondpie.com/jailbreak-ios-6-with-official-cydia-on-iphone-and-ipod-touch-a4-using-redsn0w-0.9.15b1/

Ps. Jailbreaking does not void your warranty, it was fought over in court and Apple lost.

I think that the best software you can use if from absinthejailbreak.com. It will walk you through the process and be able to jailbreak your phone.