Normal 700MB CDs can handle up to something like 760MB AFAIK, but normal burners don\'t support what is called overburning, i.e burning outside the normal limits.
I have a Plextor burner which long was the best one you could get (and still is VERY good), I have no problems getting 750MB down into a 700MB disc.
And remember, 750 is including TOC and other stuff, which normal file burning doesn\'t include