well, what's your usage?
its fine for basic usage~

its should reach 3 hours, enough?

http://www.lelong.com.my/Auc/List/2009-11D...z-CPU-NO-OS.htm
according to that, its 6-cell

certainly the k50ij is faster, since both of them is different purposes notebook.
asus 1005 is more into word processing and light browsing with long battery life...

if you really need the long battery life, consider acer 1410T, at rm 1499, 6++ hours battery life, while still better performance than asus 1005, and the difference with the k50ij would be only slower processor, while still having the netbook size/weight.

but for main notebook, I would really suggest taking bigger notebook, k50ij, it will be easier on the eye in long term~

just make sure the seal on the box is still sealed when you buy it,  then make sure the accessories is there like the cd, battery, adaptor, mouse (iinm).
and also make sure the spec is the same with the one you are going to buy.
then don't forget to register the warranty online.

router would do.

of course can, its going to be yours anyway
check it at the shop, if not the same, ask to exchange.