Oh and be prepared for the "Are you sure you want different size tires front to back?" discussion when you go to your shop. Naturally, that will preclude tire rotations, and they will warn you that they will wear prematurely. I either you are ok with this or not...and if you go all the way to the shop w/o having thought this through, the shop will be inclined to believe you are getting in over your head on this decision. So when they ask you, your answer better be, "Yes, I'm aware of the rotation issue, and I accept the trade-offs."
As for the reality of the trade-offs of not rotating the tires, it could be anywhere in the range of "not nearly as bad as they make it out to be" to "yeah, this is a definite liability". It all depends on how well the balance of front-to-rear traction is achieved with the setup. If you drive such that a majority of loading occurs to the rears (lots of tire-challenging acceleration and power-oversteer antics), those wider rear tires will probably be up to the job better than the stock oem sizes. If, however, it is too much traction in the rear such that the fronts have to work harder to turn the car (due to an understeering behavior), then the fronts will probably be seeing premature wear (especially on the outer shoulder of the tread).
If you luck-out, all 4 tires will just happen to wear out as a set, or maybe just a pair of tires on one end will wear more frequently (but not excessively short life), such that you then only need to worry about replacing tires 2 at a time (which is easier on the pocketbook). If it is just a bad, bad situation, then you'll just see 4 tires wearing excessively quick in entirely different ways, and there is simply no recourse (since rotation is out of the picture) other than frequent replacements.
So that is why I picked the particular combo of tires I did. A nice grippy tire up front to ensure I don't fall into the understeering zone after putting wider tires on the back, while the wider tires on the back are there to augment the thrust traction to better handle the awesome Hemi torque as you mash it in first. I picked those tires specifically because it looks like the tread blocks on the shoulder are fairly compliant to allow a bit of oversteer-play to help the fronts. I did not select a sporty/grippy tire for the rear, because I feel in a wider tire, it would simply be too much for the fronts, and then I would be in that nasty understeer scenario.