Honestly an extended warranty may not be necessary. It's an '08 so it's already 5 years old. An extended warranty is what $2-3K? That's like 10% of the price of your car. Just set the money aside for emergency repairs. It's a VQ35 so the parts are common and repairs are reasonable, most of the parts are shared with G's and Z's mechanically. It's not like a BMW where one thing goes wrong and you're out $3K (I have a BMW and I have an extended warranty on it).
And your dash is covered until 2016 as they said since they extended it to 8 years. Since you're up in IL, it's 50/50 on whether or not your dash will bubble. It's a heat thing, my '07 had it happen and I live in GA. I looked at an '08 with horrible bubbling before I bought mine (it was from Miami). So it can happen to '08's as well. The replacement dash is different than your OEM one, the finish is different, it is more matte. I personally think the original one looks better, so I hope yours never has to be replaced. They did update the part to fix the bubbling issue and this was done in '10 (at least that's when they issued the new extended warranty on it). Before that, they just replaced the dash with one that would sometimes bubble again. When I had mine done, the service department said they were glad to have the new one since they had replaced a couple twice already under factory warranties and goodwill.