I haven't heard either but reading the web pages I would stick with what you have if you're happy, I imagine the upgrade will even deliver more and it's made in the USA.
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The Cary Audio SLP-05 Ultimate Upgrade is complete. Haven’t done extensive listening yet, but initial impressions are very good. It’s at least as good as the Formula 1 SLP-98p, and seems better in some regards. Very tight bass, providing a good foundation fot the music. Great imaging. Very sweet vocals.
Worth the money to me. If you can afford the preamp, go for the upgrade.
BTW, Cary has significant sale prices on both preamps.