Is this a "Buy It Now!!" deal for a 2005 Mustang?

Background info: I've been eyeballing the 2011 Mustang GT for a few months now. I've never really owned a "cool car", with anything more than a 200 hp, beat up engine. All of the new cars I've owned in my life, were 4 banger Japanese made commuter cars and the wimpy 4 cyl Dodge Caravan, that I owned, when I was married. I'm 50 years old and I feel like I'm way overdue for a fun, mid-life crisis type of car. I've studied the competition, like a the 370Z, Camaro, Challenger and arguably, the BMW M3. I haven't driven any of them yet, but like how the Mustang looks on paper and how it looks and sounds in videos. Unfortunately, when I crunch the numbers for a new GT, the down payment and the monthly payments look very scary, on my budget, especially since my 2004 Honda Civic runs like a top and I have zero need for a new car. Recently My ex wife, whom I have a very good relationship with, has listened to me talk about how I've done everything and given everything to my two exes and my three kids, for over 27 years and I'm ready to buy myself a new toy and do something for myself for a change.

So, here's the deal: My ex-wife's co worker, is putting her Mother in a retirement home, because she can no longer care for her Mom by herself. When the co-worker mentioned taking her Mom's 2005 Mustang down to a dealer trade it in on a new car, my ex wife told her to wait and my ex called me up. I'm waiting for pictures and details tomorrow. Here's what I know. It's grey, it sat in the garage for the past two years. It was literally owned by a little, old, retired lady, who only drove it for 3 years. I asked if it had a V8, which would make the car a 2005 aluminum block, 300hp GT. I heard the coworker in the background. She replied, "I don't know, but it rumbles when you turn it on". So, I'm guessing that the car is a grey 2005 GT, probably with very, very low miles, probably with an automatic transmission (something that I want, after driving mostly sticks for 32 years). She wants $8,000 for the car. For all I know, it might even be a Premium package GT. If this car is what I hope it is. Do you think it's a steal? And do you think it would be a good compromise, as my fun car? I could buy this car for cash, right now, versus, paying 10 grand down and $450 something a month for 5 years, to get a new one. Your thoughts?