lol where did you get that price? Most vendors for the LX platform have them for 300ish including shipping, power cable, and usb/RS232 adapter.
Thanks for the plug in, brotha. haha
Now, to answer your question. The only tuner available for the LX platform is the Diablo Predator. Since you are not mildly modded, the canned tunes that Diablo provide are great. You are not going to see such a huge gain as you have been told, but you can see up to a 30rwhp gain with the canned tunes.
You can squeak a lil more out of it with a CMR tune, but those are kind of pricey.
No one in ABQ has the CMR software for the Chrysler tuning, yet. Go to my forum and check out Stack Performance, BMC, RDP, for your Predator needs.
If you have any questions about mods or your car in general, don't hesitate to ask.