Need some help in buyin a wifi router

Hi,

Im planning to buy a wifi router for home use. Which is the best thing available at the moment? My budget is Rs.5000.

If it has a range of 1km it will really be an added bonus coz my dad's clinic will also be able to be part of the network then.


P.S: Im going to Bangkok this monday, will buying it there save me money? (im from bangalore)

and the devices i need to be operable in the network is:

Acer laptop
Lenovo laptop
Macbook
Nokia N95
iPhone

which is the standard? 802.11b or g or n?