Best tire and size for 17x10.5 in rear?

[240shorty]

I hate posting a thread like this with all the wheel threads on here, but...

I'm trying to make a decision on tire size for 17x10.5 +27 on the rears. I have hashed thru alot of threads and even PMed some folks, so I know basically what CAN work, but can't decide what will be best.

I wanted to go 255/45/17, for a more conservative stretch and tire profile. I do not like excessively thin tires. But have found that most of the better tires aren't available in that size. At this point I'm leaning towards Ventus R-S2 or Azenis RT615. I'm considering a few others as well. Those tires are available in 245/45/17, but not 255.

I also don't want to go any lower in ride height from my 225/40/18's that I currently run.

I'm considering

255/45/17
245/45/17
255/40/17

The best tire options are in 245's. Don't want crazy roll/pull or excessive neg camber. Don't want too low of a tire diameter. These may be used for occasional autox or HPDE's, but primarily daily driving.

I'd appreciate any suggestions on what sizes are preferable. Thanks.

-Steve