I just left Chrysler after 6 years working on ignition systems. Unless you are supercharging your motor, the stock plugs wires and coil are fine. The stock coil is the same used on the SRT4 (and the Viper) and packs a wallop. The coil and cables are the same as the SRT4 as a matter of fact. The only reason to upgrade plugs in your case is they will last longer. Because you have DIS the plugs fire both negative and positive so both electrodes will wear. If you spend money on platinum or iridium plugs, make sure they are dual tipped, Otherwise the stock plugs will be fine. Spend you money somewhere else.
Have fun,
Dean