Best graphics card for G41M Combo motherboard

since it does have a pci express slot 16x you can put any graphics card there, but your cpu will bottleneck the high end ones, so i think a gt 520 will not bottleneck your system:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

but this is not a gaming video card, you could go with older dx9 video cards also.
9800/gtx 250

This maybe:

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

With this card will I be able to play games like NFS?

yeah probably, NFS is not that demanding. If you want better performance you can get this:

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

which should be fine in your system, but make sure everything else like PSU's fine.

NFS old ones,Shift 1/2 will play at very minimum settings and NFS: the run will never work with this:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

if you are thinking in playing games like the run minimum would be a :
http://www.newegg.com/Product/Product.aspx?Item=N82E168...