What do you think of this? It's very cheap, will it work?
http://www.tp-link.com/en/products/details/?model=TL-WR702N
http://www.tp-link.com/en/products/details/?categoryid=&model=TL-WA730RE
http://www.tp-link.com/en/products/details/?Model=TL-WA5110G
Yes, they should work but only at 150Mbps on 2.4Ghz WiFi N. Personally, I wouldn't buy any of them. If most/all of your stuff is Apple, then the Airport Express will act as a decent Access Point (plus has 5Ghz WiFi N) and 2 LAN ports. This will also give you some "future proofing".
What is the router ?