98 Durango 4x4 (stock) what should I do now?

So my friends ex-girlfriend was wanting to sell her 98 durango a couple months back, she wanted $1500, I offered her $800 and she took it, its 4x4, has 145,000 miles, and this thing runs good! its a beast! so I got this durango for $800, the power steering hose was shot out, I replaced that, ($20 fix) next thing I did was had my local car audio shop install a Kenwood deck to replace the old stock stereo and they also ran an amp wire kit and installed 2 pairs of 6.5 speakers in the door ($300 for all), then I found an Arc Audio 900.1D amp for $200, I got the amp under the 2nd row seat, This amp is powering 2 Alpine Type-R subs that I picked up for $250, my stereo sounds very loud now, I am satisfied with that for now... (my wallet is not satisfied, lol) but was wanting to do something else, but not sure yet... looking for cheap things to fix it up and make it look better, its a brown color as you guys can see in the pics below, Was thinking next maybe having the windows tinted darker, it has factory tint right now, but I dont know... any suggestions or help on the next thing to do would great, maybe new headlights? or I dont know, this is my first durango, it is a 4x4 but will probably not be using the 4x4 much, this is just a ride to cruise around locally, I have another car that is gas friendly that I use for long trips, (since I only get 9.9 MPG in this durango).. thanks alot guys and I hope to have this durango looking better and running better soon and I will post pics with my progress and your guys help should get me there, thanks!!