Hi,
You have a few options open to you and I'd suggest you consider them well before you dive in a spend a ton of your cash.
You do not seem to have an unlimited budget so I would advise investing good money in the things that will last and significantly impact your PC pleasure. The case and monitor spring to mind.
You will no doubt have seen endless posts in favour of AMD or Intel system in this forum. I'll give you a tip - they all work, they all play games and they all crunch spreadsheets. Some do it slightly better than others. I'll give you a disclaimer so you can weight my advice against my bias. I have an older PIII system running on an Asus CUV4X board, it has 512Mb PC133 memory, GeForce GTS2 32MB vid card and IBM 45Gb HDD. The processor is a 700E running at 148FSB for 1036Mhz. My main system is an AMD system, Asus A7V133 with 768Mb PC133, 320GB 4xMaxtor HDD RAID IDE array, GeForce Ultra 64Mb TV/DVI, 1.33Ghz cpu running at 11x142 for 1.56Ghz. Now you know, and hopefully can weight my advice appropriately.
Consider the current state of the PC market for system builders.
Intel has two lines available to you as a higher end user right now (discounting the Celeron). The PIII is largely at the end of it's life but for that is a good bargain in the right configuration. The disadvantage is that anything you buy (of CPU, memory and mobo) will be trash the next time you need to upgrade (well, maybe memory will be salvageble, but unlikely). If you are not a games monster, and want a sensible mid-range system it will do the job. For a PIII system I'd go with Crashman's eternal advice to all PIII potentials, get the Asus CusL2 mobo, with a 700E pocessor and run it at 133FSB, which it will do easily, and stick 256Mb PC133 memory in it. CPU and memory will run you about $180, with the board about another $100 or so.
Intel's current flagship, the P4 is a fast cpu. It is waiting for even more software to become optimised for the new SSE2 instruction sets, and when the optimisations happen, they make a major difference. The downside? Well, this cpu also has little future ahead of it - it ill soon morph into the P4 Northwood - meaning that all current P4s will be motherboard incompatible with newer P4s. There may, or may not be a clever adaptor in the future, but don't hold your breath. So the arguements above apply, except the performance will last you much longer becasue of the better initial performance. The memory RD-RAM will be transportable to your next P4 PC, and possibly others in the future - who knows - I don't. I do not mean to skip the P4, but from what you are saying right now it does not _appear_ to fit in your world, but we'll come back to it later.
Now we get onto AMD. There is a lot of issues spoken regarding AMD cpus. I'll admit freely that this is the first and only AMD system I have built, and that by reading, researching and planning my system I had no problems whatsoever with any incompatabilities of either AMD nor Via hardware. Some people do however and I can only attribute this to blind luck, poor user engineering or a combination of the two. There are, in most cases, alternatives to VIA hardware, and there are some pretty crappy Intel solutions around too if you look for them. AMD therefore has a few tradeoffs. Generally in terms of bang for buck, AMD processors and solutions will win against other CPUs. This is mostly noticable right now if you run benchmarking software or are a really high end video/3d/number cruncing type of user. With this in mind, yes I do think you need to plan you installation a little better, have all the drivers and updates you'll need and research your components. I'd recommend this though to an Intel user too.
The AMD will probably give you a faster machine than an Intel solution for the same $$ but you should also consider upgrade path. Remember I told you that the PIII is at the end of it's path, and that the P4 will fork in a few months onto a new socket/motherboard format? The AMD is currently stated by AMD to retain the same motherboard and socket configuration for at least the next generation of CPUs. What does this mean? It means right now you could spend $70 now on a Duron 900 and later upgrade to a 1.8 or 2ghz "Athlon 4 - Palomino" cpu without changing your memory or motherboard. This could save you $$ down the road.
Okay - time runs on and I've written far too much already - what is my advice and conclusion?
My 1st advice is to wait (if you can) until the Northwood P4 is delivered and see what state the market is in. The current P4s will likely take a substantial drop in price when the Northwoods hit the streets and you may be able to buy a currently unnatainble 1.7Ghz P4 for a good price. By that time the market will be more settled, P4 and SSE2 will have been around longer and RAM prices will have dropped another few percentage points. You can still opt to go the AMD route if the Northwood does not drop the current P4 prices. Intel dropping the P4 prices will also force AMD prices down, as will the new AMD desktop Athlon 4 chips, so you cannot really lose there.
If you have to buy now, I would recommend the AMD solution to you. Do you homework, research the components you'll use and invest in the ones that will last you 'many pcs'. A good monitor and case will still be good in 5 years, but your cpu and harddisk will be hopelessly out-dated by then. Get a mid-speed AMD cpu, Duron or Athlon, where the value is highest and the performance is still very good. The AMD route will give you better mid-term investment protection, unless you can afford to get on the P4 Northwood bandwagon, which hopefully will see socket stability from Intel once again.
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