What would be the most successful sonnet by Spenser in terms of his handling of conventional themes?

For me, I would want to turn to Sonnet 30, which is also
called "Fire and Ice." In a sense, all of Spenser's sonnets present us with a treatment
of conventional themes in terms of the love between the speaker and the object of his
affection and how this love is often unrequited. What I like about this sonnet is the
way in which Spenser treats this conventional themes unconventionally, creating an
analogy that points towards a central paradox of love. Let us note how this analogy is
created:

My
love is like to ice, and I to fire:
how comes it then that this her cold so
great
is not dissolv'd through my so hot desire,
but harder grows,
the more I her
entreat?

Likening his beloved
to a block of ice, and the speaker to a raging fire thus presents us and the speaker
himself with an interesting conundrum. Why is it that ice is not melted by the ardent
fire of the lover, but only grows hader? As the poem continues, we see the reverse is
also true. Ice does not put out the smouldering passion of the lover, but only serves to
increase its intensity, making its flames burn all the harder. The poem concludes in its
final couplet with the truth that this points
towards:

Such
is the pow'r of love in gentle mind
that it can alter all the course of
kind.

Thus this poem takes
the conventional theme of unrequited love and presents it in such a novel way that helps
explore the way that love, in the way it overrules us, also can "alter" the normal rules
of nature through presenting us with this paradox.