Which one to use for home use for cisco access point?

[gathapakal]

I understand there are three firmwares - lightweight for use with external wireless controller, but what about IOS XE and EWC?

Basically what I want to do is connect to my ISP router and extend my internet to a deadzone with the cisco access point with the same SSID and pass.

[Flavio Miranda]

@gathapakal 

  You can use Cisco Catalyst Access Point with EWC.  But, just keep in mind that the AP will not extend your ISP´s Wireless network. What it will do is create a new network with the same SSID and password, if you configure in that way. 

 But, when you move from your ISP router to your Cisco AP, there will be no roaming. There will be disconnection and reconnetion.