Once again, I must ask for your opinions

Are any of these shows, in your opinion, a MUST see (or atleast up there with the great ones) and why? Or, should I avoid one?

Ghost in the Shell
Full Metal Panic
GunGrave
Berserk
Hellsing

I realize these might seem like classics to a lot of you but with my even more limited space I am wondering if I "have to" download them.

Thanks in advance,
xDM