It does not matter when DX9 came out, it would still take a long time to switch.
Imho switching to DX9 at this point is not ideal (it's so old and DX10/11 is so much better). Switching to DX11/10 would be better, but that's not ideal either, since many people are still using XP and therefore they couldn't play.
Having both engines like many high budget games would work, but it would require double the amount of work to keep both versions up to date. So it wouldn't work with LFS.
LFS is in a difficult position with DirectX imho. DX8 is old and many things would be easier and better with newer DX, however neither going to DX9 or DX11/10 is a good option at the moment. So what LFS is doing now is probably the best option, stick with DX8 and switch to DX11/10 when it comes more mainstream (90+% can run it).
I am using Windows 7. But you need to use SoftTH or Ati's 5000-series card with it's Eyefinity or Matrox's TH2G. They all are utilities that trick the game to seeing only one big monitor and through some clever bits show the image on all three screens.
Also in Windows XP you can use horizontal span from the GPU drivers to play on two monitors.
I have the same resolutions as you. With SoftTH it shows up as 4304x1050 in LFS. It's a bit odd, but if you take a screenshot it will show up as 4240x1050, which is the correct res. And I don't see there being any missing image or anything.
You have to adjust your screen widths (options - view) in LFS to make the image to be spread out correctly between the displays. I have mine as 1314 1681 1314. Those don't add up, but that's the best I could find by trial and error. There is one vertical strip of 1 pixel I can't seem to get rid of. It's either on the right edge of the mid monitor or left edge of the right monitor. I prefer the latter hence the 1681.
If you stretch the window over multiple GPUs the game is rendered in software (afaik) which is why it lags and you have a low fps.
And LFS does not have a "real" support for multiple GPUs. LFS only has some tricks up it's sleeve when it detects a wide resolution. But you have to use something external to make it use a triple monitor resolution.
You could use SoftTH, but as you said your monitors are physically different heights. SoftTH can't change the physical dimensions of your monitors and it doesn't compensate for the height difference (not at the moment atleast).
You need to stay on the road for the hotlap to be valid. You also can't crash in to walls or objects.
Errors on the last sector of the lap will also invalidate you next lap.
The HLVC validity indicator is on the upper right corner of the screen.
The waste issue is over exaggerated. Yes, nuclear power fission produces waste that is hard to get rid of, but the thing is that it produces a very small amount of it. Part of the waste product can also be re-used to provide more power.
Other than that nuclear reactors just emit water vapors from the cooling systems.
Ati works fine. I don't think they have anymore problems than nvidia cards.
You are maybe confusing with it's big brother the 5870 which is a very large card. 5770 on the other hand is quite small and it fits in all normal cases.
The card is installed inside the case. There is a slot where it fits. Only the connectors are visible from the back.
Getting one of those Radeon 5770s is probably your best bet. You can use SoftTH when you have the monitors.
And later if you buy a DisplayPort monitor you can use Eyefinity (the Radeon's built in triple monitor feature).
Altough most parts use the 12V rails so, you don't need much power in those other rails. Most modern PSUs are designed this in mind and the other rails have less amps, a amount that is enough for things that use it. Then as the total wattage grows mostly only the amps in 12V rails get bigger.
Maybe you should get a bit more powerfull PSU than the calculator gives out, but there is no reason to go overboard and think a 8800GT needs million watts.
Ok. That helps. Seems like that computer has a onboard graphics card. You could get a another graphics card and fit it in the PCI-E 16x slot and use the onboard card for the third monitor. That way you could use it for triplehead with SoftTH.
No, there won't be any additional lag. Hdtv's are largely the same as monitors, only differences are the added tuner and maybe connectors for other stuff than PC's.
I tried googling Dell Studio 9, but couldn't find it. Does it have a regular computer case (a big box) or is it one of those small computers?