*takes deep breath*

I've decided to build myself a second system. My current system (AMD Athlon XP 2200+) bogs down pretty bad with all the multitasking I do. Especially since my switch to dual monitors I've realised that I'm gonna need dual processors to keep up. So I'll be retiring my current system to endless number crunching apps I run in the background and build a new system with an AMD Athlon 64 3800+ dual core processor. I'm pretty set on this little baby as its a steal for the price and appears it can be easily OCed to 2.4 Ghz.

Some of the other components I'm less sure about. This is my first custom build so I'm hoping to take advantage of others experience. I've narrowed my search to what I believe will suit me best, but I'm very open to opinions on how these components may interact and other options available.

My choices of mobo seems to be ABIT KN8 nForce4 as it supports my processor, is cheap and appears to be reliable. I'm unsure of the difference between that and the Ultra of the same series. Whats the difference? I was also looking at one with SLI capabilities but since I don't game, or run even a single high end GPU, I dont see the point in paying for that feature.

As far as RAM goes I want 2 GB. The gigaram fits the mobo properly and seems reliable. So does OCZ. Any preferences? Others to recommend? Anything to avoid?

My main concern comes from the PSU. My first inclination was to go for one of the nice n' cheap case/PSU combos available such as this. 480W PSU would likely meet the requirements (1 7200RPM 160GB HD, X2 processor is nice on power, 1 LightScribe DVD burner, possible a generic 52X CD Burner, a mid-range GFX card, 3-4 fans). But it appears that cheap PSUs have a tendancy to explode. I'd hate for that to happen (duh). SO maybe I should go for a nice cheap case, and buy a good solid PSU. I have no idea where to start with that. Theres so little to compare stat-wise. So, what do you all think?

and.... exhale....

/*edit*/

And I'd love to save some money as this is starting to exceed my unofficial budget, so if you know of anywhere I could save some cash and still build a stable system, I'd appreciate knowing! I started out merely intending to upgrade my CPU (and hence mobo) and this has grown a little out of control.