The KA24DE is a good engine. Common problems include oil leaking from the front timing cover, leaking intake gaskets, upper chain rattle (corrected by removing the upper chain guides) and oil leaking into the distributor. It's often called a "workhorse" engine like the KA24E. It's not the best performance-type engine, but things can be done to increase it, if you want to invest the money. The L30 Altimas of 98-01 had better body reinforcements than the U13 Altimas of 93-97 and had a stiffer ride and better handling, IMO. A Sentra SE with the 2.0L gives you the versatility of a 4 door sedan but a little kick from the SR20DE. Add a turbo and it'll make a nice sleeper! Altima does offer a bit more room for those long trips, though.