Font and font-size of a Good powerpoint presentation
1> Title of the ppt should have font size of 40, on first slide, and
font should be either Arial or New Times Roman.
2> Heading of slide should have font size of 38.
3> Sub-heading should have font size of 24
4> Sub heading content font size should be of 20.
Its always prefer to have font of Arial or New Times Roman.
Why only Arial or Times New Roman?
By the way, feel free to use thesenic nice free templates for your presentations.
DO agree with you, nice templated for personal use.