3 Addressed OP's comment
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You have a good choice right in the text of your question:

To top it all off. . .

Edit to address OP's comment:

Well, I don't know if this goes too far in the opposite direction, but it's strong on the face of it and cheekily ironic:

But most importantly. . .

You have a good choice right in the text of your question:

To top it all off. . . .

You have a good choice right in the text of your question:

To top it all off. . .

Edit to address OP's comment:

Well, I don't know if this goes too far in the opposite direction, but it's strong on the face of it and cheekily ironic:

But most importantly. . .

2 added 5 characters in body
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You have a good choice right in the text of your question: To top it all off....

To top it all off. . . .

You have a good choice right in the text of your question: To top it all off....

You have a good choice right in the text of your question:

To top it all off. . . .

1
source | link

You have a good choice right in the text of your question: To top it all off....