hey zjohn...I'm from upstate NY as well! w00t for New Yorkers!
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A good system for cheap eh? Hmm...I'll see what I conjure up for you...
does it have to be very upgradeable?
AMD style:
Case + PSU:
Antec Sonata - $90 see below for cheaper options
Mobo + CPU:
ECS w/ Xpres 1100 onboard -$132 w/ Athlon 64 3200+
RAM:
Super Talent DDR2 667 - $50
HDD:
Seagate -$45
~$315 this gives you upgrade options, but you can go 939 and get a cheaper CPU. No monitor
Perhaps you can save more by getting a cheaper PSU+Case: here's a suggestion:
Rosewill Case + 350W
New total: ~$265
Intel style:
Case+PSU: Antec Sonata II mentioned above - $90 or cheaper model: $26 (w/shipping $40)
Mobo:
ECS Xpres 200 - $60
CPU:
Celeron D 356 of if you want to save some money, get a
Celeron D 347 These have 65nm process so they run cooler and use less energy (supposedly) $55-$63
RAM: Super Talent DDR2 667 mentioned above -$50
HDD: Seagate 80GB mentioned above - $45
total - ~$265
no monitor
Cheapo(ish) style:
Case + PSU:
Powmax - free!
(although quite risky, I had a powmax fail on me) I'd go with the Rosewill for $27 (9999 limit per customer? lol)
Mobo:
AsRock GeForce 6100 $45 although the Biostar for $66 or the Gigabyte for $55 are more reliable
CPU:
Semperon 2800+ ooh...you get a free wallet! $35
RAM:
Wintech Ampo DDR400 $37
HDD:
WD 80GB $42
total ~$170
$200 with Rosewill case+PSU
Of course these are just suggestions, you don't have to follow a single one of them. They're just here to help you
Oh, and if you do decide to buy instead of build, there are some pretty good options out there. Dell has a $500 desktop deal
here, although it can't be upgraded much because of the case.
I say build! Because it is more fun and you get to customize the parts that you like. Plus you can upgrade the systems more than you can with a Dell.
@g-paw yeah, the PSU's in prebuilts aren't very good, although they may work with an adapter if it is a low power card that requires a connector, such as an AGP ATI 9700 or an 7600GT AGP.