Suggest me best need for speed..?

i ve played underground series and most wanted,now i m lookin for somethin new..can anyone tell me which one is the best among shift,carbon and world?i dont want to start hotpursuit directly...please post the answer if u ve played at least two out of them..thnx in advance..
Update: my platform is pc..and i wanna be strickly addicted to nfs..
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