if you're looking at upgrading mobo/cpu, I'd recommend Intel over AMD right now. Intel just out performs and is pretty cheap. Just get a decet mobo and a bottom-of-the-line core2duo... I think the socket's going to last awhile so you can upgrade it as you get money or need better performance. You can even go quad-core.

As far as gfx cards are concerned, the power connects are the standard molex connectors like you use for CD-ROMs and hard drives. I just daisy chain off my case fans. :p

I'm still personally happy with my 8800gtx, other than it seems to overheat sometimes. It's better since I replaced a dead case fan and got all the accumulated funk out of its heat sink.

On toms hardware people suggested this:
AMD Opteron 180 Denmark 2.4GHz 2 x 1MB L2 Cache Socket 939 110W Dual-Core Processor

Doesn´t make it more available though.

1.So what should i be looking at when comparing two motherboards?

2.How big a difference is there between lets say nforce4 and nforce5

EDIT: Ok i see my mobo supports DDR400 memory but the new gpu's are already in DDR3.

Which motherboard to get depends on a few things.

1. CPU. Obviously a mobo can only have one type of cpu socket. So the first stop is what cpu you want to be running.
2. Chipset. Once you know what cpu you want, it's up to the chipset. There are typically several chipsets out per cpu at any one time. For the Intel chips you'll see an Intel chipset, an nvidia chipset (nforce), an Asus chipset, and maybe some others. The only way to know which one to get is to do some reading up on the internet. I'm a big fan of nforce (drivers are great) but I think Intel's chipset is current higher performing. I dunno, you have to read.
3. Features. Once you know your chipset, you can look at the various mobo manufacturers' offerings and find a motherboard with the features you want. Some may have an extra RAID controller, others may have more USB ports, etc etc. Some of the higher-end boards have a ton of configuration options in the BIOS for overclocking, for instance. Plus you want a mobo manufacturer from a reputable manufacturer that doesn't have a lot of issues.

So, there's the skinny. In most cases people make a brand preference and stick with it. I like nforce motherboards manufacturer by Asus and Abit, for instance, just because I've had good experiences with those. Other choices are just as legitimate.

Regarding the memory, don't confuse video memory with system memory. Current graphics cards use DDR3. Most modern systems use DDR2 for system memory. I believe nvidia just came out with a reference board that can use DDR3 for system memory as well, but it's not the standard yet. Graphics memory and system memory are entirely separate. Your motherboard won't affect your on-board graphics memory... it'll only affect graphics memory if you're using shared mobo memory for the graphics card which you'll probably only be doing with a crappy graphics card.

There is a really good chance i can get my hands on Athlon 64 3800 X2 cpu.

Now i need a "Total idiot guide: how to change a cpu". Im fairly sure that the above mentioned cpu is without a cooler, its just the chip. And ofcourse its used.

Is it the same socket as the previous cpu? If so, it's not too hard.

1. Remove old cpu cooler
2. Remove old cpu
3. Clean new cpu and put on some thermal paste
4. Put new cpu in socket.
5. Put cooler back on.

If it's a different socket, you need a new motherboard. Regarding the cooler, your old cooler may be good enough. I dunno.

Yea i specifically looked for the same socket. So i need some thermal paste, do they come in different shapes/sizes/density/whatever?

1400*1050 is the max reso the LCD supports, and i already tracked down the problem to SLI. When i disable SLI, games run fine @ 1400*1050. If i turn it back on the vibrating comes back.