Possible to add cpu/gpu to microATX build?

[jourosis]

I'm starting to try to put some components together to build a new, small form-factor rig. Upcoming conditions won't allow me to continue using my tower. I was wondering if I'd be able to use any of these items in a new build on I'm assuming a microATX board. Smaller the better, but still need to maintain ability to edit photos in RAW, ideally run a serviio server at times, dualboot Ubuntu/Win* and being able to play Counter-strike still would be a plus. Nothing too taxing, but every detail helps. Below are pasted various parts pulled from Belarc:

3.00 gigahertz AMD Athlon 64 X2 Dual Core
128 kilobyte primary memory cache
1024 kilobyte secondary memory cache
64-bit ready
Multi-core (2 total)
Not hyper-threaded
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Board: ASUSTeK Computer INC. M2A-VM HDMI 1.XX
Bus Clock: 200 megahertz
BIOS: Phoenix Technologies, LTD ASUS M2A-VM HDMI ACPI BIOS Revision 2201 10/22/2008
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AMD Radeon HD 6450 [Display adapter]
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[jourosis]

Guess I should add I'm trying to do it on as low a budget as possible, but would still like to have it quiet too. Brands aren't that important. Any suggestions for replacement parts or just new parts in general like case/MB would be appreciated too. Thanks.