I wouldn't buy a Gigabyte mainboard, having had issues in the past because the mainboard that the 17 year old expert at the shop recommended wouldn't do the DIMMs that the expert recommended with it. ASUS never gave me trouble.
The harddisk you chose is incidentially the exact same I use with a mobile rack for backups, so I guess I couldn't say anything bad about it!
For the a solid state disk, I'd prefer the OCZ Vertex 4, but opinions are like assholes -- everybody has one. In any case, I'd go for something bigger than 64GB, so you have a little reserve. If you have to buy a smaller CPU to afford the SSD, then so be it. A solid state disk is the single biggest win, so one shouldn't ever economize there.
For the BluRay drive, it might be worthwhile thinking about buying that as USB. It's something I've done with my last computer. The advantage is that you can just pull the cable and during the 29 days per month when you don't need an optical drive, it won't consume power or delay your computer when booting.
Now of course Windows 8 ... this is the probably biggest mistake possible. I've already had this opinion after trying Windows 8 preview on my desktop back in the time, but now that I own a Windows 8 tablet for somewhat more than 2 weeks, I am even more convinced that Win8 is total fail. It is not even very usable for tablets, but even less so for desktops. Just say no. Windows 7 is so much better.