Questions about modchips
 

I have a few questions about Playstation 2 modchips. I just need a chip to play US NTSC games on my PAL PS2. So, should I buy the Magic modchip or something else? And what's the difference between 3.0 and 3.5? And is modchip.com to be trusted, I mean, do they sell working Magic modchips? Thanks.