(adsbygoogle = window.adsbygoogle || []).push({}); I am going to buy a ps3 on 3.55 firmware and I was wondering what I need to download once its jailbroken? what to use? and should I use George hotz 3.55 jailbreak? please help me

You have to download nothing if you don't want ^^
but download a higher one not a 3.55.

what do you mean? i want to be able to play mw2 and hack on it?

Just install Rebug 4.41.2 on top of 3.55 by following the guide below:

1- Install Rebug 4.41.2 from XMB:
Download Rebug 4.41.2 from Rebug's website, verify the md5 hash, rename the PUP to PS3UPDAT.PUP, put it on your FAT32 formatted flash drive in PS3\UPDATE, go to System Update and Update via Storage Media. Make sure there's NO original game disk in the drive and that you DON'T Update via Internet or else you would risk installing OFW higher than 3.55!

2- Enable QA:
Install Rebug Toolbox from Package Manager, launch it under Games, go to Utilities and enable QA. This is to ensure easier and safer downgrading.