Not to sound quaint, or conceded or anything, but I've owned a lot of trucks and SUVs in my time, my 2008 is my first 4Runner (but not my first Toyota, I still own a Gen 1/2000 Tundra in fact) and if I was forced to trade it today I would first look at the Gen 5 4Runner (2010), and then at new, unsold Gen 4s (2009) and then at used Gen 4 4Runners in general.
It is far superior to anything I've owned in the class (Durango, Blazer, TrailBlazer (I still own one of those for work BTW), K Blazers (older full-sized), Tahoes, you name it - consider, my first vehicle was a 1977 Dodge Ramcharger)) And by superior, I mean in every way - fit/finish, ride, power and overall quality - and I am a died-in-the-wool GM guy at that. My weekend car is a C6 convertible, my wife's most recent 2 cars were a 2007 Monte Carlo SS (5.3L V8) and her current Pontiac G8 GT (LS2 V8).
If you held a gun to my wife's head and said that I had to shed the 4Runner and get something, anything else but not another 4Runner - I'd opt for its sister, the Lexus GX - certainly since the new one (the 4.6 V8) comes with an AWD system similar to the V8 4WD 4Runners of late-Gen 4. I love the stability and control the pseudo-AWD (F/T 4WD) system provides, even if it yields only 20mpg on the highway. Like my Tundra, I will likely own my '08 V8 4Runner until I or it dies.