Need Advice On a budget HTPC build

APPROXIMATE PURCHASE DATE: in the near future
BUDGET RANGE: $500-$600
SYSTEM USAGE FROM MOST TO LEAST IMPORTANT: HTPC
PARTS NOT REQUIRED: keyboard, mouse, monitor, speakers, OS
PREFERRED WEBSITE(S) FOR PARTS: newegg.com, ncix.com tigerdirect.com, compusa.com
COUNTRY OF ORIGIN: USA
PARTS PREFERENCES: I don't really know which is good for this intel or amd.
OVERCLOCKING: No
SLI OR CROSSFIRE: No
MONITOR RESOLUTION: 1024x768, 1280x1024, 1440x900, 1600x1200, 1680x1050, 1920x1080, 1920x1200
ADDITIONAL COMMENTS: low power, low noise, small HTPC

I have a GIGABYTE GA-M61PME-S2P if its anygood haven't use it though still in the box packing