I did quite a lot of research when I bought my Daytona Charger -- I wanted something to wake up my baby Hemi (5.7). I found Whipple made superchargers for the older engines, but nothing for the new ones. Check for superchargers at www.highhorseperformance.com
or there was a place in Arizona that makes a newer type supercharger for the Dodges.Good luck!
For my 5.7, $5,600 makes 123 rwhp more and for "only" $700 more, it'll make a total of 250 rwhp (or, about 530 rwhp)... I believe your 6.1 will get more of a boost!