Set or 4 245/45/17 or 275/40/17 tires?

[downsouthman1]

I have 245/45ZR17 Phantom ZRX up front. I've run those tires up front for over 2 years not but about a yr ago upgraded my rims to 17X9. Same tire. After the rim upgrade I changed my rears to 285/40ZR17 Phantom ZRXs. I love the rear grip now, even in the rain. They also make a 275/40ZR17 Phantom ZRX. But I paid about $160 a pop for the 285s. Phantoms are good holding tires.