The 7th Amendment in today's money?

I was leafing through my pocket-sized Constitution today when I came across the 7th Amendment, which reads as follows…

It occurs to me that the Founding Fathers didn’t foresee the abandoning of the gold standard and the subsequent inflation, and assumed that $20 would always be the same sum of money. Of course, while $20 was a substantial bit of change in 1791, nowaday’s it’s barely enough for a dinner for two. If we were to rewrite the 7th Amendment today using the equivalent of $20 in 1791 money, how much cash would have to be at stake to get you a jury in a civil trial?