Well you could just go to
www.dell.com and look at the components they are using for the computers and have an idea What is included in a retail computer. It depends what your expect in your computer build. Maybe make a list of prices it would cost to build a computer. A lot depends on the size of the case the amount of storage you need like hard drive or an SSD.
Another idea is to look at some of the builds on this website.
Just keep in mind Dell likes to build one size fits all with Win 8. Often Retail Computers are also yesterdays technology.
Just make a list and price it out.
I just built a computer with these kinds of parts:
I was going for using Wifi to be able to move my HDTV and computer around the house where I want it. I found it works well for streaming HULU etc.
CASE: Cooler Master 130 Elite MITX case $45
Pwr Supply: CX430 Modular $45
Motherboard: Gigabyte Z87N Wifi, Ver 2.0 (802.11ac/n) $129
CPU: Intel 4330 i3, 4 Meg Cache, HD Video 4600 $129
RAM: Gskill Ares 8 Gig (2 X 4 Gig) $70
Hard Drive: Western Digital Blue 1 TB $69 (Had to RMA) Takes like 14 Days
Optical Drive: Used DVD Free or $20-$50 (Maybe Blu-Ray)
OS Win 7 Home Premium $99 (Look for Sale)
Need keyboard/Mouse? Need to get Wireless Keyboard Logitech K400 $40?
Monitor: Using a HDTV.
Speakers: HDTV
Microphone: ???
Camera: ?? (Skype Use)??
Headphones: ??