Ok, I was getting a little annoyed that the stuff didn't sit in the Dell case very well, and the motherboard standoffs were done by an amateur (me) and the plastic outer casing needed to be modified, so I went online and searched for some new cases. I found this one:
and bought it here for under $30 shipped.
This one already has the mobo standoffs in place, and is ready to go out of the box and is within the budget for this. (Most cases like this, even on ebay, are running at around 50 or more) So it was worth it to not have to finish the dell case.
I plan on painting the front bezel satin black, and instead of installing the floppy disk, I'm putting the second hard drive in that spot. The opus 250 that I'm ordering will replace the sfx 200 that's in it now. The case will go into a locking carpetted cabinet attached to the sub box on drawer slides. To keep symmetry the opposite side of the box will be a storage area for automotive tools like jumper cables, the jack, the lug wrench, etc. The whole cabinet setup is actually pretty cool, I can't wait to implement it. It slides out, then hinges in toward the center of the car, and the top hinges open to access the stuff inside.
I looked at some reviews on this case, and overall they are positive. The main con is that the case is hard to open (at least the test models that the reviewers had) the other con is the noisy PSU fan, which will be replaced anyways...
I'm ordering the PSU very soon too, so as long as I get the dash fab done, I can have this in pretty quick.