Gravity and Expansion

In my useless planetary astronomy class today (I hate learning about the planets - I want astrophysics and cosmology back), my teacher, who is an astrophysics major, mentioned the universal life cycle. She said that we know that the universe is expanding, and there is no end in sight.

This got me to wondering - if gravity (which we cannot define, other than an idea and it's effects) is all reaching, regardless of being an endless force, shouldn't we depend on the big crunch? I then took into account the Theory of Anti-Grav, a polar opposite of the Theory of Grav (sorta like Matter/Anti-Matter), and wondered which of these two forces wins out in the end.

For me, I would hope that Grav beats it out - a big crunch is a more satisfying death to the Universe than a cold freeze. Better to go out with style than to fade away into oblivion.