Depending on the condition,.. the Draglites are worth a little more than the Cobra-R's. There are so many different Cobra-R wheels out there you need to be careful which ones you get. Some wont accept the standard lugnut either,.. they need a smaller (Outer circumference) nut in order to fit a lug wrench or socket around them inside the wheel. The one's I have are like that and will not work with 'regular' capped lug nuts.
Your car will sit lower more comfortably (with out tire rubbing) on Cobra-R wheels in the back than with 275/60 tires. 275/60 is a pretty tall tire with a lot of sidewall like Tommy said.
The one issue you may be concerned about with Cobra-R wheels is if they are 17x9 wheels. They may rub up front,.. and if you run coil overs up front you will more than likely need to run a 1/2 inch wheel spacer to keep the rim/tire from rubbing on the coil overs up front.
These are 17x9 rims with 245/45 tires up front instead of the normal 275/40. Even with the narrower tire they rubbed and needed a 1/2 inch spacer. You may try a 17x8 wheel up front with a 235 tire instead if you have coil overs.
Hurst