Talonslair, if budget is tight, it's best to build it yourself. Heck, even if you've got money to spare, it's still best to build it yourself.
You know one of the big pluses of SimHQ? You can SET YOUR OWN BUDGET, go shopping, then post your prospect setup, and a lot of people here are willing and knowledgeable enough to help you out. You can take their word, or you can take their word as advice, use it as a springboard for your research, then make your own decision. I take anywhere between 2 weeks and 2 months just to research and decide on a part --- basically, I see what the trend is, research it, then "sell" it to myself.
Also, one reason to "spend just a little more" on a new PC is to future-proof it. What this means is to buy a PC with specs a little higher than what you need them (ie, a little more overhead) so as to be able to "cope" with games coming out 2-3 years down the line.
Now if all of the above makes sense to you, here's a little nudge in the right direction. You will want a decently powerful quad core CPU. Intel i5's and AMD Phenom II x4 comes to mind. You will want a decent, branded motherboard, the spec of which will depend on the CPU you decide to go with. You will most certainly want a powerful videocard. In fact, buy the fastest card you can afford. Two videocards isn't necessary, one powerful one is enough. Good quality DDR2 or DDR3 RAM is next, and look at the 4-6GB range. Whether you go dual-channel or tri-channel will depend on the CPU/motherboard setup you select --- if it supports dual-channel, 4GB or 8GB is the way to go, if it supports tri-channel, 6GB is sweet. Finally, you want to power your new rig with a dependable powersupply. Again, depending on your CPU/mobo/GPU setup, you might get away with 600W, but 650/700/750w might be worth the investment, if nothing but to assure you that you've got enough "juice" for the whole thing.
So again, in order of priority, you will want the fastest GPU, then CPU, then motherboard. I would say GPU decision comes fourth, as it gets the whole thing running, and then RAM comes in last, as it is cheap and easy to replace later on as funds allow.
Hard drives, optical drives, monitors, etc. are secondary items as far as I'm concerned. Sure, you can get faster load times with an SSD, but I see you're on a budget so that's not really an option --- better use the money on a GPU.
Hope that helps, welcome to the forums (though I see you've been lurking for a while), and congratulations on your first posts!
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- Ice