Kurt, the Nitto 05's are a wonderful tire, and I have posted before recommending them. That said, I would not consider them ideal if you are really looking for three season performance. I find that although the car feels predictable and balanced, they have very low grip in the wet. Requires slowing down and exercising caution.
I did get caught in a relatively epic slush and snow storm with the Nitto's (on the way to a track day actually). The whole experience was, shall we say, 'memorable'. The Porsche guys in our track group had great fun passing me on the highway.
Some of the Esprit guys in Vancouver BC for example (think like 200 rain days a year) echo this; Nitto's great in the dry, wet not so much.
I blasted thru 2 sets of Nitto's quite quickly, tracking the car occasionally. For the track they are wonderful, but wear relatively quickly. I can dig out the mileage figures if that is of interest. I would have bought a third set, but unfortunately there was a supply blip when I needed them.
If you do go for the Nitto's, you may want to purchase an extra pair of fronts; I found the fronts go off at about twice the pace of the rears. Would be interested to hear from others on that, but that was my experience.
I went with Falken Azeni's FK-453's this time around. Apologies if I got the model number wrong; just reading off the sidewall and it is awkward.
Not sure of the present supply situation on them, but I purchased from my local tire guy with no issues.
Very few miles so far. Feel harder than the Nitto's, but may be more what you are after. One short aborted track Day so far (due to other issues with the car). Grip levels definely below the Nitto's, but they look like they are going to be more durable. Way nicer in the wet. Don't have the specifics to hand, but better wear rating than the Nitto's. Might be a nicer all round tire for you?
As you mentioned run flats and have already experienced a blowout, note you may have fitment problems with the supplied spare on the front due to brake clearance. 2000 and later V8's have different brakes, but they did not change the spare wheel. There was a thread mentioning this issue a while back. I purchased a recommended spacer on-line that gets around this issue, and have added it to my tire kit. Anyone that has this potential issue with their V8 and wants a spacer, hit me up before LOG37 and I will bring an extra one with me (they are sold in pairs so I have one that is surplus to my needs).
Stu in the Great White North