3rd i5 + GPU VS i7 w/out GPU for HD, games, music making

getting a $650ish laptop with 3rd generation intel i5/i7.

People told me a GPU's needed for Counter Strike Gloabal and HD video playing + editing. However, Intel lists Counter Strike Global as a game any 3rd generation Intel can play without a GPU if it's an HD 4000/2500 gfx model with Windows 7 64-bit (and assumingly windows 8 64-bit). I'd be getting an HD4000, so an HD2500's lesser quality doesn't matter. Intel link: http://www.intel.com/support/graphics/intelhdgraphics4000_25 00/sb/CS-033387.htm
Someone playing CS Global no problem with Intel 3rd generation CPU, HD4000 gfx without a GPU and a decent amount of other players http://www.youtube.com/watch?v=1UOle1uU_B8

This Intel video says all 3rd generation CPUs with intel HD GFX can PLAY HD smoothly. And, I assume blue ray because there are 3rd generation Intel laptops with blue ray players and no GPU. I don't want blue ray, just saying. Also, some forums say full HD can play on a 3rd generation Intel HD4000 gfx without a GPU but sometimes tweaks like bitstream or codex are needed.
http://www.intel.com/content/www/us/en/architecture-and-tech nology/hd-graphics/hd-graphics-video.html

About 5 sentences in, Intel says all 3rd generation CPUs with HD GFX can EDIT HD video: http://newsroom.intel.com/community/intel_newsroom/blog/2012 /04/23/3rd-generation-intel-core-processors-bring-exciting-n ew-experiences-and-fun-to-the-pc

For about $650, an 8GB RAM laptop with either a low-end 3rd gen i7 without a GPU or a mid-to-high-end 3rd gen i5 with a GPU can be had.
I'm assuming the i5's at least a mid-grade i5, and the i7 would be low-grade i7. I'm trying to figure that all out, but this PC's so slow you have no idea, and I'm in a rush for Black Friday sales.

I want an i7 for a music making program with virtual instruments. I'm asking a music forum now if an i7's even needed considering what I'm trying to do. Also to make internet and Windows Explorer faster, but I assume I'll never even max-out an i5 with just internet and Windows Explorer, and everything will be instantaneous.

IOW, the only reasons I should get an i5 + GPU instead of an i7 without GPU would be to play video games that are more advanced than Counter strike Global and to play/edit full HD video without having to configure things like codex and bitstream?

Much Thanks.