No, I also play other strategy games, but all of them require minimal system resources. I would like to try out some roleplaying games (e.g., City of Heroes) and I have a friend who is pushing me to join him in playing WarCraft online. I'd like to be prepared for any strategy games that come out in the next three to five years. Most likely, I will never play the really demanding 3D games, though. Still, based on what most people are saying, it sounds like I should bite the bullet and get the GeForce 6800, even though it will increase the cost of the system by about 20%
Lets go ahead and be honest by saying that it's pretty doubtful that you're gonna be able to get a comp that will really be able to play games 5 years from now. Still, you're going to get the most longevity out of a 6800GT.
Why is it not easy to upgrade a Dell PC?
Dell is notorious for using non-standard components. If you are able to upgrade at all you will probably have to do so through Dell.
ie:
-You usually can't replace a Dell power supply with a standard ATX one. It won't fit.
-If you buy one of the smaller desktop models you may find that you don't have room for expansion cards... like a new graphics card.
-Then if you went to buy a new case so that your graphics card would have room, you'd probably find that you couldn't put your Dell motherboard into the new case, since it's not a standard ATX motherboard.
-Should you want to add more RAM, you'll probably find that most RAM you buy will not work with your system. You'll have to buy the RAM direct from Dell (I think Crucial also offers Dell-compatible RAM), either way it comes out being much more expensive than standard DDR/DDR2 RAM.
No, I don't even know what PCI-Express means. (I know what PCI means, but I don't know what "PCI-Express" means.)
PCI Express (or PCIe) has the same basic purpose as PCI or AGP (side note, AGP was used only for graphics cards, while PCIe can handle all expansion cards), it's just much faster. Your new system will be using a PCIe card - you look at the names you posted in the first post, that's what "PCI Express x16" is talking about
This article might be a little on the complicated side, but if your interested:
http://www.pcstats.com/articleview.cfm?articleID=1087
Also, don't buy DELL, fo for an AMD64.
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Why?
AMD processors at the moment give better preformance than Intel's. AMD processors are also cheaper than Intel's, not to mention that AMD motherboards are cheaper than Intel mobos.
Honestly, a Dell system would probably serve you just fine. Building your own PC is fun though, and has the potential to be cheaper. If you are interested in building your own, I've got parts arriving next week for my new system and plan to write up a little something about how to build your own PC, if you want to see what's involved.
Just to give you an example of what you could do:
Athlon64 3000+ (Venice core, 90nm) - $146
ASUS A8N-E motherboard - $120
eVGA GF6800GT - $309
Corsair ValueSelect DDR400 RAM 1Gb (2x 512) - $90
Maxtor 200Gb SATA150 HDD - $86 (of course you can save money here if you need less space, or get a larger drive for a little more)
Antec Mid-Tower case w/ 350W PSU - $79
All total: $830