I'd pass on the red one only cuz I bought my 99 with 81k miles for $7k. It's a 4 cyl, 5 speed, was in mint condition, no rust, and had all service records. It even included ONE cigarette under the seat. You can do you better than the red one, just keep looking.
As for the 4 cyl, mine has 104k miles on it and the manifold gasket was bad. It sucked cuz the rear most bolt of the exhaust manifold broke off. Now the head has to come off. Other than that no problems with the 4 cyl. It's not as bad on the highway as people make it out to be. I have 31's and no cargo and I can stay in 5th 98% of the time. It's a different story once you start adding heavy accessories and loading it up with cargo.