core 2 duo i think you mean, and yes its the fastest processor at the moment.
Im an AMD boy though(ive got an Athlon 64 x2 4200) does me for all my gaming and anything else i happen to throw at it

Depends what you do on the pc though, if its not hardcore gaming id get an AMD as its much cheaper, but if you do game then you will need to do some research or ask someone on here which is the best Core 2 to go for as theres some better than others(speed wise), and some that can over clock much better than others(if your into overclocking that is)