Which of these 3 selections is the best option, don't take price in to consideration.
Crucial Ballistix Tracer 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model BL2KIT25664AR804 - Retail
http://www.newegg.com/product/product.aspx?item=N82E16820148180
OCZ Reaper HPC Edition 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model OCZ2RPR800C44GK - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E16820227267
(2) OCZ 2GB ( 2 x 1GB ) PC2-8000 1000MHz 240-pin DDR2 Memory - OCZ2TA1000VX22GK
http://www.buy.com/retail/product.asp?sku=203388316&SearchEngine=DealTime&SearchTerm=203388316&Type=PE&Category=Comp&Gad=0&dcaid=15891
Crucial Ballistix Tracer 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model BL2KIT25664AR804 - Retail
http://www.newegg.com/product/product.aspx?item=N82E16820148180
OCZ Reaper HPC Edition 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model OCZ2RPR800C44GK - Retail
http://www.newegg.com/Product/Product.aspx?Item=N82E16820227267
(2) OCZ 2GB ( 2 x 1GB ) PC2-8000 1000MHz 240-pin DDR2 Memory - OCZ2TA1000VX22GK
http://www.buy.com/retail/product.asp?sku=203388316&SearchEngine=DealTime&SearchTerm=203388316&Type=PE&Category=Comp&Gad=0&dcaid=15891