Thank you all - whitestar_999 , Ishu Gupta , Sainatarajan , Utkarsh Sharma , panwala95 , S.S gadgets & The Sorrow, for your advice.
I'll try to squeeze in some more cash in my budget to go with I3-2120 & if that does not happen, even G620 will be a fair deal.
Thanks again to all of you...