I would expect you to only sell the mobo, CPU, & RAM and maybe the 5850 since there's the 6950 now. Also, the upgrade to SB is an improvement, X58 is so good I wouldn't bother until Ivy Bridge and LGA 2011 or you at least see what Bulldozer can do. Nevertheless, I'll price each part:
$200: Asus P6X58D Premium Motherboard
This is strange because although it's a premium part, I doubt you'll find many people that would take it over the ASUS P67 Pro for $189.
$45: Corsair Dominator 6GB Triple Channel DDR3 7-7-7-20 Latecy
You forgot to state the speed. I assume it's 1333CL7? Either way, with 8GB going for $75, 6GB is worth about $60 new. Although triple channel is worthless if it's not in an X58 build.
$180: Intel i7-930 @ 2.8 Ghz
The value will increase in enthusiast threads if you say what it overclocks to and what voltage that's at. My i7-930 is a lemon and requires exponential voltage increases to go beyond 3.9GHz. I paid $200 new for it last year, so I'm still happy with my price/performance. i7-950's are $270 new now.
$120: Corsair HX850 Power Supply
Awesome PSU, but nobody likes a used PSU. I wouldn't play any of the prices I'm listing for these parts.
$55: 1 TB Western Digital Black Edition 6 Gb/s SATA III 64MB Cache
HDDs don't really drop in performance or longevity with age. The fact that it hasn't failed in the first couple months actualy improves its reliability over a new drive. I priced it to match the similarly performing (and usually preferred) Samsung Spinpoint F3 1TB new.
$90: OCZ Vertex 2 100GB Solid State Drive
$180 buys a Vertex 2 120GB new w/ rebate now. That means a 100GB should go for $150, but I don't think they still sell it. SSDs drop in performance/longevity with usage and the buyer has no idea how it's been used. I'd never buy a used SSD. So it's pretty tough to give it a value. I'd buy it off you if you were a "Regular" or higher for $80 w/ supplemental info about it.
$120: XFX Radeon HD 5850
I'm assuming you mean the lifetime warranty version? That's worth $10 in itself. I think they had these on Newegg last week for $145--a deal, true...but I can't say a used one is worth that.
$70: Cooler Master HAF 922 Case
This is really tough because my used case LOOKS used. Does yours? If not, then it's worth up to 90% of it's current $100 price tag.
$20: SATA DVD Burner w/ Lightscribe
These don't really drop in price.
TOTAL: $900
It looks like I valued it at $900 total exactly. That said, I would never recommend anyone buy it for $900. I put together better builds for $726 (8GB DDR3, i5-2500K/P67) last week. But those didn't have SSDs either. Like I said, you should sell the CPU, mobo, RAM, & graphics. Keep the rest because you'll never get what it's worth to you back.
Ebay: You might get a little more for each part that I listed above on ebay. Because people like to overpay for used electronics on ebay.
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