Wifi for floor house?

I have a 3 story house as well, and found that i didn't need any new equipment. I have a Linksys wireless router that i have my modem plugged into. I put it in my room on the second floor, and it reaches everywhere in the house fine with no loss of signal. The only problem you may have, is if you have a computer in the basement. I haven't tested this, but i suspect you wouldn't get reception, so you may need extra equipment for your basement. Good luck to you. Having a wireless network can save you a lot of hle. CAT5 cables can be annoying to set up.