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[Yonzie]

Looks good, but should the expenses to date not be under the income/expenses thing?
I understand that it's hosted at home somewhere? Be more explicit about how crappy the current solution is! Include pictures of the box under your bed ;-)

You should go for a 1u box... Don't know about the places you are looking at, but it's usually cheaper. The case is also cheaper, if you know what to get. Go for a Chieftec 1u case. Not the best in the world, but solid and the cheapest available. You may need to fix up a little ducting (depending on the CPU) since the fans are badly arranged, but that's nothing more than the price of a bit of tape. A PCI riser card is included with the case.
It's (probably) not a problem with the hw, since normal unbuffered non-ECC memory is small enough to fit. You can get a 1u heat sink & fan for ~40€.
If the motherboard in use does not have integrated graphics, an extremely stable intel (as in made by) p4/celeron desktop board can be had for <100€, although you have to remove the sound header at the back for it to fit. I've had about 30 of those in my hands, 0 DOAs, 0 defects the first 6 months.
Tyan has some even nicer ones, but they are twice the price (or more).