Here is what I use as a router:
http://www.newegg.com/Product/Product.aspx?Item=N82E16833704037
Here is a switch
http://www.newegg.com/Product/Product.aspx?Item=N82E16833156066
Most routers have built in firewalls and you can secure them using the WAP security. So, you should, if you have a wireless router, set up a password on it so only those folks who know it can use your wireless internet.
Hope this helps,
micro...