I just bought all the parts for my new PC build as well. I was on the fence between i7 and i5. After looking on newegg for days and days trying all sorts of different configurations i ended up deciding on the i7. There was really not that much of a price difference between the 2 systems.
All of the parts were exactly the same. The only difference was the RAM, CPU and Motherboard. I was looking for a motherboard with Dual Gigabit LAN ports so that narrowed down the search.
The Ram was rougly $140 for 8GB of DDR2 or $119 for 6GB DDR3
I ended up getting the i7 920 from Microcenter. They are a local Computer store here...Also in NY and GA...i think CA too. It was only $199..they have the i5 for $159
All in all, i might have been able to save $100 if that by going the i5 route. I decided that i would rather spend the extra money up front than have to buy new ram/cpu and mobo later down the road. At least this way when the other higher end i7s come down in price i can upgrade only the cpu and not need a new Motherboard or RAM.
Here is a list of my parts ....hopefully it helps you make your decisions.
EVGA E758-TR 3-Way SLI (x16/x16/x8) LGA 1366 Intel X58 ATX Intel Motherboard - Retail
Item #: N82E16813188046
EVGA 512-P3-N954-TR GeForce 9500 GT 512MB 128-bit GDDR2 PCI Express 2.0 x16 HDCP Ready SLI Supported Video Card - Retail
Item #: N82E16814130378
G.SKILL 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Triple Channel Kit Desktop Memory Model F3-12800CL9T-6GBNQ - Retail
Item #: N82E16820231225
Western Digital Caviar Black WD7501AALS 750GB 7200 RPM SATA 3.0Gb/s 3.5" Hard Drive - OEM
Item #: N82E16822136283
LITE-ON Black IDE DVD-ROM Drive Model iHDP118-04 - OEM
Item #: N82E16827106274
PLEXTOR 22X CD/DVD Burner Black IDE Model PX-870A LightScribe Support - OEM
Item #: N82E16827249053
Rosewill RCR-IC001 40-in-1 USB 2.0 3.5" Internal Card Reader w/ USB port / Extra silver face plate - Retail
Item #: N82E16820223103
Acer X223Wbd Black 22" 5ms Widescreen LCD Monitor - Retail
Item #: N82E16824009145
Antec TruePower New TP-650 650W Continuous Power ATX12V V2.3 / EPS12V V2.91 SLI Certified CrossFire Ready 80 PLUS BRONZE ... - Retail
http://www.newegg.com/Product/.....6811129021
http://www.microcenter.com/sin.....id=0302727