Having owned both sets of wheels, I tend to lean toward the SRT-6 wheels. The reason being that the SRT-6 wheels aren't seen very often as there are fewer SRT-6 models than Base or Limited Xfires. Of course, there are few XFires to be seen period.

The Limited wheels also look great on the car. They are nice looking wheels.

In summary, you have a nice "problem" to resolve.