OK, lets settle the HTPC build first.
HTPC parts:
RAM: G.SKILL PC 12800/1600MHZ DDR3 CL11 VALUE RAM (4GB) (53)
SSD: OCZ VERTEX 460 120GB (99)
HDD: TOSHIBA 1TB 7200RPM (69)
DVD-RW: LG 24X DVD-RW SATA OEM (25)
PSU: FSP 300W 80% ATX PSU (39)
Case: CM 344 MICRO CASE (44)
OS: WINDOWS 7 HOME PREM (120)
Total cost: $449
Buy at PC Themes, #04-15, and ask for discounts. DIY yourself. If you can't into DIY, get PC Themes to assemble for you for a fee.
How to transfer your stuff from the A4 rig to the i5 rig:
1) Build your HTPC first, install the WD HDD into the HTPC, install the Toshiba HDD into the i5 rig. Do not clone the WD HDD yet. Install the Windows Home Premium into the SSD in the i5 rig.
2) Install the software programs that you want to transfer over in the i5 rig first.
3) After you got both rigs running, get a ethernet cable and connect both computers with the cable through the LAN ports. Create a network between the 2 rigs. (Normal USB cables will not work.)
4) From the A4 rig, run Windows Easy Transfer and use it to port over Internet settings, user account settings and software settings.
5) You can proceed to clone the WD HDD over to the HTPC SSD after you are done. There is no need to reinstall Windows 7 Professional for the HTPC.
Read this for more info about Windows Easy Transfer:
How to Use Easy Transfer in Windows 7 - For Dummies
Windows Easy Transfer - Wikipedia, the free encyclopedia