The one suggestion I have is that if you plan to upgrade to Windows* 7 at any point in the future and wish to use Windows XP* applications (XP compatibility mode), make sure the processor supports virtualization. You should be able to verify whether or not the Intel processor in question supports Intel® Virtualization Technology (VT) by looking them up in ark.intel.com. http://ark.intel.com/VTList.aspx
You can also compare the processors in question within ark.intel.com to see which has the features you need.
You should also check the Microsoft* web site to make sure your system is Windows 7 capable.
Intel Customer Support
*Other names and brands may be claimed as the property of others.