Definately going for the mods! After spending about 3 hours researching last night (the CAI thread was great!), looks like I'll go with the AFE Stage 2, 18" magnaflow with custom Y pipe and true 2 1/2" tailpipes (maybe I can talk the local shop into building a true dual with a Dynomax Ultra Flow X?) and after seeing MADDOGs dyno sheet, the DSP is the way to go.
RIP - 03 Hemi SLT QC; uncorrected 14.68 at 90.46 w/ 2.08 60ft - stolen July 06