You're comparing apples to oranges. You can do a really cheap shotty job of building up a 2.4L with a junkyard turbo, crap manifolds, no intercooler and jimmy rig the rest of it. Or you can spend a mint on brand new everything for the 2.4L... off the shelf ported head, brand new turbo, new intercooler, polished aluminum IC piping, MS, etc... Sky's the limit. You need to compare what you want with how much it costs vs how much time you need to spend on it and make a decision. SRT-swaps are pretty straighforward. A lot more is involved with a custom 2.4L turbo setup.
95moparracer has a complete SRT swap for $3500. Engine, ECU, harness, Trans, K-member, clutch, seats, etc.. basically everything to turn a regular 2nd Gen into an SRT-4 minus the suspension I believe. Engine, ECU, Harness, seats, would also work in a 1st Gen.