Prince Fielder Rookie Cards: Upside?

Does anyone have an idea of the relative current prices of high end Prince Fielder rookie cards and can estimate the potential increase in these cards if he has a breakthrough season next year (or the year after)? Does playing in milwaukee hurt his value? Can the value of his rookie cards see the same rise as Ryan Howards?...or will they be in the same range as players like Lance Berkman or Mark Teixiera...both of whom had similar increases in their stats their first few years in the majors, but a relative stagnation in the prices of their rookie cards? thanks.
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2005 Origins Old Judge Brown #/20 and Black 1/1s, 2000 Ultimate Victory Gold #/25
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