Re: slimline case to normal case?
All components could not be standard if it was a slimline case if I'm correct, because a standard sized ATX motherboard would not fit into the case.
But, you shouldn't have problems fitting a slimline motherboard into a true ATX case, because pretty much all ATX sized cases will have extra screw holes to fit smaller motherboards in place (or at least I think so),
But, if you are upgrading, since it is pretty outdated, and are worried about the motherboard, etc, the motherboard might be too outdated to support newer hardware to warrant an upgrade with it.
Abit IP35 Pro / Q6600 G0 / Zalman 9700 / 8800GTS 640mb / 4x 2GB Corsair XMS / X-FI Xtreme M / 1x 1TB / Antec 900 / Logitech Z-5500 / Samsung 20inch