well.. in that case you may consider for a economy class
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p) sound card (e.g.Creative Vibra 128, ~$30) or if you want more *sound* from your computer then get an Audigi
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and you don't have to worry much about the LAN bit because it's built into most motherboards these days or you could get one for ~$15. Ooh.. yes, if you could be satisified by onboard sound, you don't even have to get a sound card
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(you can have 5.1 even with onboard sound)
And motherboard.. if you are not a computer junkie who always upgrade and can wait for 2-3 years, you can probably settle with motherboards in the $100-$130 range, also, check out what CPU you want.. if you want a cheaper CPU, an Athlon is definitely your choice, personally I would recommand the XP 2600 chip (it's always better to get the semi-latest chip because they are not very expensive compared to the top one and you still get good performance). If you want a P4 you'll be looking at an extra 100 bucks compared to the XP 2600.. but I don't think that would be necessary in your case
hard disk... go for a 80GB one, the difference (in price) between a 40GB one and a 80GB one is only about $10-$20.. if you want better performance, pay an extra ~$30 for 8MB of buffer
If there's not much gaming, 256MB (DDR 2700, can go for DDR 3200 if you want to) would be sufficient and then all you'll need is a normal graphics card. Here you are probably looking at the FX5200/Radeon9200.. if you are not sure about what graphics card to get, it's always better to get the mid-range ones (i.e. FX5600/Radeon9600 Pro) and that would cost you from $90-$140 or $160-$300 respectively (that depends on the brand.. but the cheaper ones also work really well)
assume you want a DVD combo drive.. that would be ~$100.. just add them up together
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post again if you need more help
p.s. if you need a specific spec. and price, you'll have to tell us EXACTLY what you want
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including whether you'll be gaming or not.. etc..
Note: those posted above are just personal recommandations
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