Well, an Core i3 2100 is just fine for gaming, 3D Video editing and normal internet browsing etc and that would save you some money too so that you can get a better GPU for that price. However, you cannot overclock the i3 2100 as it's multiplier is locked. My suggestions :
Processor : Intel Core i3 2100 3.1Ghz - $124.99 - 32nm Sandy Bridge - 2 Cores / 4 Threads.
Motherboard : Intel DH67GDB3 - $104.99 - 4 DDR3 Slots, SATA 6GB/s, USB 3.0
RAM : 8GB (2x4) Corsair Vengeance DDR3 1600Mhz - $74.99 - Specially designed for sandy bridge processors
HDD : Seagate Barracuda ST31000524AS - $59.99 - 1TB 7200 RPM SATA 6.0Gb/s 3.5"
Case : CoolerMaster Elite 341 - $44.99 - MicroATX Case
Case Fan : CoolerMaster R4 120mm Blue LED fan - $9.99
Power Supply : CORSAIR Builder Series CX600 V2 600W - $67.99
GPU : Asus GeForce GTX 560 GDDR5 1GB - $194.99
I would aim for the i5-2400 if you're still on a strict budget. It's a quad core and has a better L3 cache. This will give the i5-2400 an edge over the i3-2100 in 3D design. The i3-2100 is on par with the i5-2400 in games as no games really utilize more than two cores. I think the i3-2100 will work fine for you overall since gaming comes first. If you find some extra money, go for the i5-2500k along with a $100 Z68 board [P67 works fine]. Amazing overclocking capability, simply a beast. Motherboard is pretty standard, I wouldn't go Intel for motherboards. MSI is a good brand along with Asus and Gigabyte. I will also count ASRock as a good brand. G.SKILL offers quality ram at low prices. Samsung Spinpoint F3 has good performance at low prices. You wanted a tower case with side panel windows but that will probably cut into your budget too much. The Cooler Master Mid Tower I found is blue and has a good side view. There's $25 before $700 that you can invest in shiny LED lighting. The XFX is actually built from Seasonic [Super reliable, no doubt about it].
The last recommendation I would make is to spend a little more and get the 560 ti instead. MSI has a better overclocked one but EVGA offers lifetime warranty. It has better performanc along with good noise and temperature level. Check out this review: http://www.tomshardware.com/reviews/nvidia-geforce-gtx-...
ahh.. I myself have made a big mistake by buying an Intel DH61WW board.
I didn't know that MSI H67 boards costs only a few dollars more than that. and the shopkeepers in India are well-known for misguiding buyers.