Modifiers of BETTER:
the film was a lot better than... lots better ... a (damned) sight better than .. far better than... a little/bit better than..
As for the choice between RATHER and QUITE before 'better', I think it would be worth considering the difference in register (and consequently in meaning) between the two.
well, i think that the correct answer is RATHER, because this word is used when something is better than expected, as an intensyfier of the surprise of the persone talking.