This should be etched into stone somewhere.The cost of boosting a motor is proportional to the amount of power he's looking to gain.
Base on my past experience I would rather have a larger NA motor then a smaller boosted. While you can get the power out of that motor, it comes at a cost. Reliability, financial, re-sale etc. Modified cars don't typically do as well as the factory optioned cars. If you beat on the car you open yourself up to a bad build + beating = new motor.
Don't get me wrong, that 3.6 can likely be worked to get 400+ HP if he wanted to. But 15-20K would get him closer to a SRT which has things like - the tranny to hold the power, an LSD, and bigger brakes. To really push the motor to you might opt to pull it and upgrade internals. That's a lot of work for something that is available from Doge off the shelf.
I don't mean to discourage you OP but modified cars are work. If you cannot wrench yourself you end up paying someone to do it. Will you get into logging? Winter and summer maps? Will you forge internals? Do you know when you need to go forge internals (IE a mild boost not required)? Very few custom builds will be as reliable as the one the factory put together. Simply because they spent more time designing the systems.
Then there is the sad reality that an aggressive built often doesn't last. Your rings wear out, or you have a lot of blow buy consuming oil. So you're constantly checking levels, concerned you might damage the motor. Or it doesn't run really well in the cold, so you're babying it until it warms up. Forged pistons can have slap went cold, so you have small oil burn and a diesel sounding motor. These are all things to be aware of.
If this is your regular daily driver be careful.
Maybe so...but Tidalwave is probably the only Kit available for the Pentastar Chargers now...A Vortech kick is a good kit.