44surf, I just realized why your current front panel connector (2x5 block) won't fit on your current front panel header on your mobo (remember, you only need to use the right most 5 pairs.
The problem is that one of the pin holes is blocked (referred to as "keyed" so it will only fit one way, it also made it look like a serial port connector in this case). That being said, you can usually "unkey" the block. Like how I described removing the wires from your FP connector (insert through the opening), you should be able to push the same straightened paperclip through the backside (same side the wires go into) to push the plug (small piece of plastic) out.
This should save you a trip to Fry's. Check it out and let us know if that did the trick.
Also, FYI, the power switch pair can be wired either way (pos or neg), so the order of that pair is irrelevant when you plug them in. The LEDs, however, do require that the wires go the right way. If you hook everything up and the LEDs don't work (and they were working before you started this project), just reverse the order of the wires and the LEDs should work.
Are you having fun yet?