buying an M30, need advice

Hi

Thank you very much for the details.

I test drove the car today. Let me tell you how it was so that you can check
if the seller's telling the truth.

1. When I shift from park to D, the rear of the car goes down slightly and
when shifting back to park, the rear of the car goes up a little. the guy
told me that this was normal.

2. While test driving the car, I 'suddenly' accerlated from '0' to see if it
would race forward but the car moved kind of slow, little wobbly i guess,
and the second gear changed with a slight thud, (I have this in my nissan
sentra ). The RPM was somewhere between 4000 and 5000 when this thud
happened. Is it normal for an infiniti to behave this way? I thought it
should be better than a Nissan tranny.

3. The driving comfort was good although the leather seats were somewhat
pretty stiff. I crossed a railway track and it glided over very smooth. that
was really amazing.

4. Under the hood, everything is pretty clean, the engine is very silent,
does not shake when cranking up the car. The paint is original and no dents,
nothing. only thing that kept me from purchasing it right then was the
tranmission shifting. I checked the tranny fluid, it was transparent, and
soon it will be brown, i guess. the guy bought the car with 85K miles on it
3 years back and now it has 145K miles on it. He mentioned that he changed
the tranny fluid at 130K miles, but then I was wondering if the color would
change from bright red to almost transparent in just 15K miles.

How much would be a good price for the car? just a guess. interior is 'ok'
with cracks on the leather and the 'exterior' is also 'ok'.

Can you advise me anything?

thank you
mk