Or you could just use PSP XI which gives over 90% of the functionality for a tenth of the price.
Lightroom isn't sufficient on its own - it's not an all-in-one RAW converter and editor yet, and whether you like it depends to some extent on what you feel about the database system.
IMO it's a great shame that Adobe has a virtually monopoly in the 'pro' market - their prices cannot be justified, especially on this side of the pond.