Due to the nature of the cross compatible connectors (HDMI, Composite(RCA yellow/red/white), Component(red/green/blue)), you will be more than able to connect any device that offers the aforementioned connections to the Samsung TVs, regardless of manufacturer. Unfortunately, since I do not know all of the connections offered by all of the different devices on the market, you will have to refer to your devices’ manual to find out which connection is best to use with this Samsung TV. There are no special converters required. Aforementioned Cables will be required for normal operation.

For your reference, the UN32EH4003 offers the following connections:
HDMI: 2
Component: 1
Composite (AV): 1
USB 2.0: 1
RF In: 1

-MrSamsung

From the available information, although the EH5300 will offer compatibility with a traditional standard USB keyboard and mouse, it will not offer support for wireless peripherals.

However, the ES7500 will indeed be compatible with both USB and Bluetooth wireless Keyboards and mice. I would recommend using the Samsung Wireless Keyboard/Mouse option called the VG-KBD1500, with the ES7500.

-MrSamsung

In order to access Captioning, you will want to head into the TV's menu, then into the setup or system sub-menu to access the CC options or to just activate it, press the CC button on the remote control. However, CC is only available via the coax cable since the CC signal has to be sent by your service provider. The CC information cannot be sent via HDMI or other secondary connections from 3rd party devices. That said, most service provider set top boxes and DVD/BD players will handle CC on board, which will then be displayed on the TV as part of the video signal. If your TV is displaying captions, but the caption system is turned off at the TV, then most likely the captions are coming from the 3rd party device that is connected to the TV. Captions are subject to your service provider’s availability. Additionally, the CC option cannot be set to come on automatically when MUTE is activated.

-MrSamsung

From the available information, it seems that the 1000 series and 2000 series Ultra Slim Wall Mounts will not be compatible with the UN40ES6100. Unfortunately, I do not have any information about Best Buy carrying the compatible Ultra Slim Wall Mount (WMN250M). Please contact a Best Buy representative for information on ordering this specific mount.
The UN40ES6100 will also be compatible with a universal wall mount that offers a VESA Bracket size of 200mm x 200mm.

-MrSamsung