first off, adopt.... 2nd off YES get 2 cats, you will love them as kittens then as they grow they will be bestest of friends.
we have 5 so a few rules.... always have 1 more litter box than cats. (we have 6 litter boxes)
get em their shots, because of the ferals. also if you want your furniture 100% cat scratch free, buy them cat trees and cat scratchers, cardboard scratchers are cheap and last a while (messy kinda with those cardboard shards from cat scratches) there are 2 type of cats bush dwellers who like to be on the ground, and tree dwellers- you guessed it, they like height... so depending on which ones you get youll have to watch and see what kinda tree to get. also TOYS.... we have probably 50 fake mice throughout the house/outside. keeps em busy. paper bags are cheap, so are boxes. we had an extra room so we gave it to the cats (pic with them sleeping) get em used to teeth brushing early, so they dont become pains later. and if you get more than 3, be prepared for territories.
if you look in the pic where the cat is crying at me, i have a doggie door going outback with that metal (horse) fencing. its about 30x30 so they can go inside/outside at their leisure. they have grass, and a covered patio for the rain. if there is no outside access for you, make sure you get some bird feeders and put em by windows.
haha sorry to go on and on, but there are a few things that most cat owners could do to make thier animals healthy and happy that they dont. also a great site
onlynaturalpet.com
good stuff for them instead of chemical stuff. good luck and POST PICS when you get em!!