I'm not sure, as I stay away from refurbished products... it's probably just titled refurbished because it was an open box sort of like you get discounts at a store for open boxed items.. the refurbished items I normally seen were faulty items, but got the fault corrected.
anyhow...
Intel Core 2 Quad Q6600 Kentsfield 2.4GHz 2 x 4MB L2 Cache LGA 775 Quad-Core Processor - Retail
http://www.newegg.com/Product/Produc...82E16819115017 -
$280 free 3day shipping
GIGABYTE GA-P35C-DS3R LGA 775 Intel P35 ATX Intel Motherboard - Retail
http://www.newegg.com/Product/Produc...82E16813128048 $149, not free shipping
Support for DDR3 1066/800 MHz memory modules Support for DDR2 1066/800/667 MHz memory modules
-will put you at about $30 under $500 with shipping added in on the two.-
Western Digital Caviar RE WD2500YS 250GB 7200 RPM 16MB Cache SATA 3.0Gb/s Hard Drive - OEM
http://www.newegg.com/Product/Produc...82E16822136055 $75
-note no SATA cable included, needs to be purchased seperately, also not free shipping
PSU - power supply unit... the thing you plug your power cable into and distributes the power to your computer.
OCZ StealthXStream OCZ600SXS ATX12V / EPS12V 600W Power Supply 100 - 240 V CB, CE, CSA, UL, FCC - Retail
http://www.newegg.com/Product/Produc...82E16817339003 normally don't suggest OCZ, but with the rebate and the free shipping, 600W @ 80% efficiency is pretty good deal for $70
for the case, just do a little research and keep an eye on the fans included and the number of extra fans that can be added to it... main factor of finding a case is not appearance but cooling efficiency.. appearance is just a bonus.
for ram, prices change all the time, you said you would be purchasing some other time so we'll have a look then.
LITE-ON Black 20X DVD+R 8X DVD+RW 8X DVD+R DL 20X DVD-R 6X DVD-RW 12X DVD-RAM 16X DVD-ROM 48X CD-R 32X CD-RW 48X CD-ROM 2MB Cache SATA DVD Burner - Retail
http://www.newegg.com/Product/Produc...82E16827106057 $35, does not include shipping... this includes SATA cable. a lot of them don't, which could make up for the few bucks difference.. price was at $28 when I bought this particular one last month... but newegg raises prices depending on how many wish lists an item is on, and that award might have raised it.
EVGA 512-P3-N801-A1 GeForce 8800GT 512MB 256-bit GDDR3 PCI Express 2.0 HDCP Ready SLI Supported Video Card - Retail
http://www.newegg.com/Product/Produc...82E16814130296 $260, no free shipping
so without RAM and a case...
$984 before rebate... $969 with rebate... + shipping for all
you did not factor in cdrom/dvdrom, harddrive, and psu to your calculations... which add a little bit.
if you have cdrom/dvdrom to use as well as a harddrive then that can be deducted... though i can pretty much guarantee you will need a larger PSU than you have.
you said you were willing to go an extra hundred on the cpu/mobo so maybe that can go towards the PSU. to make a total price range of $1100?
don't forget about a case though, they range from 70-120 for pretty good cases.