Yes, newegg is more reliable, but I wasn't sure about pricing, the sites I recommended are trusted sites, but nothing compares to newegg.
I only requested the optical drive because I had to keep it on a short budget. Of course you could add a different optical drive or replace the one I offered, but I was just giving a general daily-use drive.
Sorry about the links being dead, I tried to Link it because some people were having problems with the long addresses, but I guess it's a different issue.
edit: Yes they would work, but if you're worried at getting a mid-tower case, maybe a full tower case such as the thermaltake armor or something will suit you better.