worth it

A few "worth it" questions (lol)

Is upgrading my G15 rev 1 to the Razer Tarantula worth it (I am tempted very much)

Is upgrading my G5 revision 2 worth upgrading to the new G9? (I AM TEMPTED LOL)

Is upgrading my 7900gs worth upgrading to a 8800gt?

Please help me out, feel free to recomend alternatives :)

Thanykou

My advice is to upgrade the video card but stick with G5dayaccus007

what about e6600 core 2 duo to quad core (lower rangE)

Thanks guys :)