Help with DIY Mini ITX Computer

Hey folks!!

I am really tired with macs, linux machines and laptops. I have been using one bad device after another. I just want a simple, cheap mini ITX with a Monitor and Keyboard/Mouse to Work!!

I stay in Bombay, and the service here is not on par. My only intent is to sell off my Toshiba Satellite L655D (it's like flogging a dead horse) , and get a decent kit to build my own mini itx, with my hands, screw driver and basic knowledge of hardware. I need to use Autocad for mechanical design and am really desperate to get a good system to run it. (No games , no hollywood effects , just mechanical software).

These are the Maximum specs I will be looking for till the next 5-6 years.

(C) Autodesk Website:

Operating System : Microsoft Windows 7 and Above

CPU Type: 32-bit Intel® Pentium® 4 , 3.0 GHz or higher with SSE2 technology
OR
Intel® Xeon® with Intel EM64T support with SSE2 technology
Intel Pentium 4 with Intel EM64T support with SSE2 technology)

Network : standard

Memory 2 GB (8 GB recommended)
Display Resolution 1024x768 (1600x1050 or higher recommended) with True Color
Display Card Windows display adapter capable of 1024x768 with True Color capabilities. DirectX® 9 or DirectX 11 compliant card recommended but not required.
Disk Space Installation 6.0 GB
Pointing Device MS-Mouse compliant device
Plotter/Printer : system printer and HDI support
Media (DVD) Download and installation from DVD
ToolClips Media Player Adobe® Flash® Player v10 or up
.NET Framework .NET Framework Version 4.5


Please suggest which mini itx board (even a smaller factor will do), accessories, peripherals should I use to keep this on a very tight budget.

Here's what I already have:

(1) Windows 7 home Premium (US purchase),

(2) Keyboard and Mouse

(3)LED monitor (Samsung)

(4) Modem and Ethernet cables.

(5) Hardware set

(6) Grit

I would really appreciate the help guys!!


P.S:

Here's what Used to Work for me on the laptop ( Please note I need Intel for all my machines henceforth):-

Processor & Chipset Manufacturer AMD (Want Intel)
Processor Type Athlon II (--"--)
Processor Model P320
Processor Speed 2.10 GHz
Processor Core Dual-core (2 Core)
Cache 1 MB
Chipset Manufacturer AMD
Chipset Model M880G

Standard Memory 3 GB
Maximum Memory 8 GB
Memory Technology DDR3 SDRAM
Number of Total Memory Slots 2

Storage Size 320 GB
Hard Drive Interface Serial ATA
Hard Drive RPM 5400
Optical Drive Type DVD-Writer

Graphics Controller Manufacturer ATI
Graphics Controller Model Mobility Radeon HD 4250
Graphics Memory Capacity Up to 1.37 GB
Graphics Memory Technology DDR3 SDRAM
Graphics Memory Accessibility Shared