Routers with the new 802.11n spec are the new generation of wireless routers that are available on the market right now. They offer far greater range and faster speed than the current a/b/g wireless routers.
The only thing about wireless n is that the spec has not been finalized yet, not until later this year. The wireless n routers that are available right now are “draft N”. If you do decide to buy a draft n wireless router right now hopefully they will work with the final spec or at least be updatable through software. Look for the Wifi Certified draft N logo on the box. And make sure to buy all your 802.11n hardware from the same company, this will ensure everything is compatible.
Do I need wireless n router? I would personally wait until later this year to purchase a wireless n router or whenever the final specs are finalized. But if faster transfer speeds, greater range and better reception through obstacles such as thick walls than draft wireless n might be your answer.