***Purchasing a 2007 BMW 4.8i. Help and Opinion Needed***

[JoshLee89]

I've finally sold my Infiniti G37 Coupe, and now looking into buying an used X5.
I've been in the market for a while, but I just can't wait for that perfect car cause there are none.(blk on blk, nav, sports 20", basically fully loaded 08 and up, with less then 50,000 miles with warranty left)
So I am just going to bring down my standards and see broader range of cars available.

Here are some specs pictures about this car I looked at today





carfax

CARFAX Vehicle History Report on 5UXFE83577LZ46184

2007 BMW X5 4.8i
75,000 miles
2 Owner. 1st cooperation title for 1 month, less than 2000 miles -> 2nd Private owner, 17k/yr. Florida driven car bought at Auction and now in Dealer in Georgia.
No warranty left (which I am kind of worried about)
Black on Black
Sports with 20" wheels
Cold Weather
Premium
Panoramic Sunroof
Heated and cooled Sports Seats
Towing Package (I want to take it off though)
PREMIUM SOUND? (How can I tell?)

No Comfort Access
No Nav =(
No automatic trunk release
No Running Board (that I want to put it on)
No Rear Climate Pkg
No 3rd Row (not needed anyways)

Condition:
Exterior and Interior of the car is very clean. I could tell the owner took good care of his car, no scratches and dents inside and out.
Drove very very nicely, No tire, wind noises that were noticeable unlike other X5s I test drove. Smooth Transmission, and Idrive Service said "OK" to every categories.
All the switches work except driver seat front extension. (easy fix?)
40% threads left on all tires. (dealer said, they will hook me up $200 per tire when I said these will cost about $2000 to replace all) I think it's not possible.

Okay. You know about the car So this is my important questions

(1) Is it a good buy with a good price? b.c Dealer said I won't find any better deal than this.
-With GA tax 7%. I got deal of $26,900 OTD.

(2) This is more of a important question.
-I need to buy "some car" that I will be using for now till Feb 2013. When I sell this car back? would I loose lot more money? than let's say, I buy 2009 BMW 335i Sedan with warranty and less miles and sell it after 7 months.
Which car will depreciate more? I am planing to sell either private or to carmax
I drive about 500 miles per month / 6,000 miles per year.

(3) Do you think I should also consider paying $1,000 ~2,000 more to purchase BMW extended warranty? If I don't, when will be my next big service? (if car does not go wrong in other minor things)

Please give me any of your thoughts. I don't know if I am thinking rationally or not at this moment.

Josh.