Thanks for the comments. Given what I have read about maximizing the amount of RAM and the guess that future software will be more RAM hungry, I decided to go with the i7-900 series. Based on comments here and on other photography websites, I've come up with the following configuration from AVA Direct:
ANTEC Performance One P183 Black Mid-Tower Computer Case, ATX, No PSU
CORSAIR CMPSU-650TX TX Series Power Supply, 650W, 80 PLUS®, 24-pin ATX12V EPS12V, SLI Ready
ASUS P6T Deluxe V2, LGA1366, Intel® X58, 6400 MT/s QPI, DDR3-2000 (O.C.) 24GB /6, PCIe x16 SLI CF /3, SATA 3 Gb/s RAID 5 /6, HDA, GbLAN /2, FW /2, ATX, Retail
INTEL Core™ i7-930 Quad-Core 2.8GHz, LGA1366, 4.8 GT/s QPI, 8MB L3 Cache, 45nm, 130W, EM64T EIST VT XD, Retail
NOCTUA NH-U12P SE2 CPU Cooling Fan, Socket 1366/1156/775/AM3/AM2, 2x 120mm Fans, Copper/Aluminum, Retail
CORSAIR 12GB (6 x 2GB) XMS3 PC3-12800 DDR3 1600MHz CL9 (9-9-9-24) 1.65V SDRAM DIMM, Non-ECC
EVGA GeForce® GTS 250 675MHz, 1GB GDDR3 1800MHz, PCIe x16 SLI, VGA+DVI, HDMI, Retail
INTEL 80GB X25-M Mainstream SSD, MLC, 250/70 MB/s, 2.5-Inch, SATA 3 Gb/s, OEM for operating system and programs
WESTERN DIGITAL 1TB WD Caviar® Black™ (WD1002FAEX), SATA 6 Gb/s, 7200 RPM, 64MB Cache for storage
RAID No RAID, Independent HDD Drives
LITE-ON iHDS118 Black 18x48x DVD-ROM Drive, SATA, OEM
LITE-ON iHAS124 Black 24x DVD±RW Dual-Layer Burner, SATA, OEM
MICROSOFT Windows 7 Professional 64-bit Edition, OEM
WARRANTY Silver Warranty Package (3 Year Limited Parts, 3 Year Labor Warranty)
together with a 1TB external drive I already have that will serve to backup data.
Any thoughts? Thanks
Updated Configuration: Changed video card
ANTEC Performance One P183 Black Mid-Tower Computer Case, ATX, No PSU
CORSAIR CMPSU-650TX TX Series Power Supply, 650W, 80 PLUS®, 24-pin ATX12V EPS12V, SLI Ready
ASUS P6T Deluxe V2, LGA1366, Intel® X58, 6400 MT/s QPI, DDR3-2000 (O.C.) 24GB /6, PCIe x16 SLI CF /3, SATA 3 Gb/s RAID 5 /6, HDA, GbLAN /2, FW /2, ATX, Retail
INTEL Core™ i7-930 Quad-Core 2.8GHz, LGA1366, 4.8 GT/s QPI, 8MB L3 Cache, 45nm, 130W, EM64T EIST VT XD, Retail
NOCTUA NH-U12P SE2 CPU Cooling Fan, Socket 1366/1156/775/AM3/AM2, 2x 120mm Fans, Copper/Aluminum, Retail
CORSAIR 12GB (6 x 2GB) XMS3 PC3-12800 DDR3 1600MHz CL9 (9-9-9-24) 1.65V SDRAM DIMM, Non-ECC
EVGA GeForce® 9800 GT 550MHz, 1GB GDDR3 1800MHz, PCIe x16 SLI, VGA, DVI, HDMI, Retail
INTEL 80GB X25-M Mainstream SSD, MLC, 250/70 MB/s, 2.5-Inch, SATA 3 Gb/s, OEM (for operating system and programs)
WESTERN DIGITAL 1TB WD Caviar® Black™ (WD1002FAEX), SATA 6 Gb/s, 7200 RPM, 64MB Cache (for storage)
RAID No RAID, Independent HDD Drives
LITE-ON iHDS118 Black 18x48x DVD-ROM Drive, SATA, OEM
LITE-ON iHAS124 Black 24x DVD±RW Dual-Layer Burner, SATA, OEM
MICROSOFT Windows 7 Professional 64-bit Edition, OEM
WARRANTY Silver Warranty Package (3 Year Limited Parts, 3 Year Labor Warranty)
together with a 1TB external drive I already have that will serve to backup data.