Top Online Motherboard Selectors
Sadly, while there are several good websites that offer reviews and opinions on various motherboard/CPU combis, there are only a handful of tools for matching up the right hardware for your PC building needs.
Additionally, these focus on Intel chipsets, so if you were planning on an AMD system, some more research is required!
First of all, the Intel website features a useful index of motherboards with Intel chipsets that can be easily sorted by processor. Available at http://www.intel.com/reseller/mbselector/index.htm, all you need to do is use the Filter by processor drop down menu to select the CPU you want and find a suitable motherboard.
Additional filters on manufacturer, model, form factor, memory type and more can also be used. Sadly no images are available, so don’t forget to Google the motherboard type to get an idea of what the product looks like and find other information such as expansion ports, on-board sound, etc.
A more comprehensive option is available at www.cclonline.com. By using this tool you can select and AMD or Intel CPU, suitable motherboards, memory and graphics options, as well as suitable power supply units, cases and cooling. While designed for use in the UK, you can still use the tool to find the right options and then order them locally.