Newbie need help!

[nite4evr]

I bought my PS2 a couple of years from now already.
It's the one with the limited GT3 package(the red box) so i'm guessing it's Generation 4 for the PS2.
Neways, It's a modded ps2 and i think the mod is pretty old.
The mod need to use gameshark to boot up games and now a days it can't boot up those DVD nemore, i used to be able to probably because my chip is getting outdated.
Neways i just brought my PS2 to the store to get it repaired(the lense) and now i wanna remod it.
I want to know, is Magic 3 good? or a chip called Messiah better?
Please help me out guys, and give me all the infos 'bout this!
I spent too much money on this system already and if i bought the wrong mod i'll probably be spending even more so please save me!