Firewire 800 - Can be added for a probably 40-90. Did a quick Google search.
USB 3.0 - Can be added for 29-40
150 for LEDs lighting the Apple logo vs 9-18 vs Acrylic transparent PC case (one of the many choices) for $73.99 (If you wanna add it. It looks more visually appealing to me
Photography - Photoshop, GIMP, and others exists in Windows, and OSX can be technically be put on PC type computers, which in turn can add things like iPhoto and Aperture.
8 Core processor - Overkill. I use an Intel Core2 Quad and it more than does the job. It cost around $350. It came with a duo processor that also was fine, but I started using more CPU intense programs.
32 GBs of ram? That's a serious overkill. I use 8.50 (I really do not know why it says .50...) and it works without a hiccup.
2 TB hardrive $59.99-120
As for me on my to do list: I'm going to see if my gaming PC is going to die soon since the two GPUs were artifacting a week ago with Sims 3: Late Night only. If they do die, I'm getting a new motherboard, and adding the i7 processor I have just laying there. I'm also going to ask Salmonella for good graphic cards I can add for reach prices. I might also make a switch to Ubuntu 10.10 since I hear they're getting good things recently. Not only that, but WINE will help run most Windows applications I use on a regular basis.