Criminal Sentence 564: Questionable Punctuation

From a Web site:

"I don't think your question is premature at all, but very relevant."

I don't think this punctuation is optimal. I kinda think a semicolon would be good, if we reword the end:

"I don't think your question is premature at all; rather, it's very relevant."

A comma in the original sentence makes the sentence too run of the mill, in my opinion. The semicolon in the rewrite adds emphasis to the fact that the question is relevant.