CPU/Mobo/RAM/GPU Upgrade Assistance, Please.

Basic Info: Looking to upgrade my CPU, Mobo, RAM and possibly GPU. Still not sure if it's worth it.

Approx Purchase Date:Looking to purchase this week.

System Usage: Mostly gaming. Some programming, 3d modeling and video editing, but all amateur.

Parts Not Required: Monitor, Keyboard, Mouse, Speakers, GFX Card, HDDs, Case, Fans, PSU (Using Corsair 750W ATX12V)

Preferred Website: Newegg.com, but I'm not tethered.

Country: USA

Overclocking: I would like to be able to, but I won't pay big bucks for it.

Monitor Resolution: 1440x900 x2 (Anything fullscreen (games/apps) runs 1440x900, but I run a dual monitor setup for everyday computing)

SLI / Crossfire: I would like to be able to, but I won't pay big bucks for it.

Additional Comments: I'm looking to upgrade. Looking at 100-150 per item. Through my research I've decided I think i3-530 looks like a good choice for processor, but most mobos I see that support LGA 1156 say "CPU Type Core i7 (LGA1156)/i5 (LGA1156)" (EXAMPLE) and don't list the Core i3 even though it's the same socket type. Will this still work with the i3-530?

FULL LIST OF CURRENT HARDWARE
Replacing Possible Keeping

Processor: Intel E6700 2.66GHz
Motherboard: Intel 975XBX
RAM: 4GB DDR PC2-5300
GPU: EVGA GeForce 8800GT 512MB
PSU: Corsair 750W ATX12V
Case: Thermaltake Armor

Thank you for your time, and I hope I made this post easy to read/understand!

Thanks!
Zack

Side Note: Wow. Basically just building a whole new PC. Haha.