No need to guess, and the price differences are not NEARLY what everyone is saying. AT MOST, the price difference is $2750, not counting the diesel.
2-Door (JK / JL / Difference)
Sport - $23,995 / $26,195 / $2,200
Sport S - $26,995 / $29,095 / $2,100
Sahara - $30,445 / N/A
Rubicon - $33,645 / $36,395 / $2,750
4 - Door (JKU/JLU/Difference)
Sport - $27,895 / $29,995 / $2,100
Sport S - $31,095 / $33,195 / $2,100
Sahara - $34,295 / $36,995 / $2,700
Rubicon - $37,445 / $40,195 / $2,750
The 8 speed is a $2000 option on the 2.0 (don't know about the 3.6, mandatory on the 3.0)
The pentastar is a $3500 option
The diesel is probably going to be a $6500 option from the 2.0 (based on the upcharge on the grand cherokee, and the mandatory 8 speed.)