Unless you already have the tower, I would rather get a HAF932.
If you have no plan on using 2 video cards, getting a LGA1366 board is probably a waste of money, you can get very nice P55 boards for 150-200$CAD; the CPU will cost you the same, but I think the turbo boost on LGA1156 is a bit more aggressive. If you decide to go for the i7 9XX, I think the price difference between the 920 and 930 is ridiculous (something like 5$) so might as well go for the 930. Regarding upgradability, I think Intel already announced they will use 2 new sockets for their next generation CPUs.
For the audio card, unless you are a professionnal or have a very fine ear, you can probably use the on-board or get a much cheaper card in the 50-100$ range.
If you can save some more $$$ by getting a smaller PSU, something like a 850W, it would be more than enough.
With all the money you might have saved from the suggestions above, get a slightly bigger SSD like the X25-M 80GB or ever the 160GB model. This will allow you to add a few programs to the drive instead of just the OS.
PSU : Corsair HX Series 1000W is way too big unless you are thinking twin nVidia 480's or ATI 5970's. Use the Corsair HX 1000 w/ the HAF 932 or Antec CP-1000 w/ the Antec 1200 if you're buying one of those two cards .... otherwise one of these:
SSD : Intel X25-V 40Gb SATA II (It's cheap, plus raid in the future?)
HDD : Re-Using two 500GB drives....will drag down performance of rest of system unless they new 500 GB per platter HD's. Use the sound card money here:
Check out the performance charts and pick whatever 500 GB per platter drive performs best under your usage patterns. The 2 TB WD Black and XT from Seagate are good choice but at smaller capacities, you are limited to the Seagate 7200.12 or the Spinpoint F3. The 7200.12 excels in gaming, multimedia and pictures whereas the F3 wins at music and movie maker. See the comparisons here (copy past link in manually, link won't work in forum):