Not sure how accurate this is but I found an calculator that seems to possibly be correct.
Engine RPM Calculator
RSX oem tires 24.9" diameter
Speed 70mph
RSX Base model 4.389 FD and 0.738 5th gear ratio = 3,060 rpm
Accord 4.389 FD with its better 0.647 5th gear ratio = 2,682 rpm
4.1 FD I found on eBay = 2,506 rpm
Now the question of value.... $1000.00 investment in 500 rpm
-Liberty