apartments

Hey guys, I am going to get possession of a shop in apartments soon. I plan on opening a combined store with few services like:- Photography (Event and studio both), Printing, Computer related work, Notes for students, Job/ typing work, some eatables, and the last very important part:- Video...

Suggest me a router which can gimme a good range b/w 2 apartments.. My router will be on 3rd floor and i want to use it on my 2nd floor's apartment..the apartments are not joined.. both are in different directions..My max budget is 2k.. I dont care about d brand i jst want quality..