Firstly, your concern about PF amount going to pension after completion is a welcome feature. After you have attained 60 years of age you start getting pension based on the accumulation of provident fund amount and which will be apportioned on a monthly basis and start crediting pension to your bank account for life, in case of death your nominee i.e., your wife will receive certain amount of pension from your PF account for her life. I hope I have clarified your PF point.
Secondly,the notice period will be stipulated in your offer/appointment letter and you have abide by it, since you would have already acknowledged the same.
The profile of the job which you have been working for 8 years is not mentioned. In case you want to scale for a higher profile you can continue to do it in the same organization,since you have adjusted to the people and management of the company.
In case you want to change your present job you are welcome to do so, provided you have upgraded your skills for a higher level through academics or training.
21st November 2013 From India, Bangalore