The L322, a good one, is a proper range rover in all respects. It out classes the RR sport, which someone said earlier is just a Disco 3 in drag.
I have a L322 & I have a Discovery 3. They are worlds apart. The discovery 3 is slightly more expensive to keep maintained, but once all the major bits are done shouldn't cause any worry. The L322, up until 2008 have gearbox issue's & my L322 has just had it's third box fitted.
As for power & performance, the disco 3 will leave the L322 in it's wake.
However, these are landrovers, & anything with landrovers isn't cheap. You need a deep pocket to own & run one.