Thanks to anyone who actually volunteers their time to offer some advice.

Right now I have:
Pentium 4 2.53ghz
120gb HD
Sound Blaster Audigy Pro
GeForce4 Ti4600 128mb

I have no clue what my motherboard is :/
My box looks something like
Although mine is custom built.

My plan is to slowly start upgrading parts until the end of the year. I plan to first change the case along with a new motherboard, then the processor, RAM, and finally a new gfx card when needed.

My question is this. I plan to buy this case . With that case, what do you recommend as a new motherboard? Will all the parts fit well in that case, or should i get one set up differently. Anything from really.

I don't want to go out, buy a new case, a random motherboard, and burn my cash in smoke.
Thanks again.