ok i have a toshiba a135-s4407 laptop 100gig hd t2250 core duo 1.73 533 buss 65 nm i'm installing a new hd 200 gig toshiba 7200 16mb cache .but i would like to upgrade cpu but not sure what i can use without problems i use 4 gig ocz 667 ram .can i use 800 buss and 2.4 to 2.53 core 2 duo ?what are my options i really would like more speed to better vista's performance pls advise in detail .