aside from the wheel arguement I need some help in picking tires sizes this is what I am thinking ?

Going on a 2011 gt 5.0l

Michelin Pilot Super Sport

Just out of curiosity what is the best handleing tire size (in 20's) ??
I was first thinking of 255/35ZR20 in the front (10.04 wide and 27.03 tall)
I was also thinking of going with wider front tire 265/35zr20(10.43 wide 27.30 tall)
back 285/35zr20 (11.22 wide 27.85 tall)
stock all around is 245/45 19 = 9.65 wide 27.68 tall
this is the toughest dession so far

I would appreciate some advice thabks in advance

SDF