Building new computer

Hello I want to try to build my first computer. So far I've bought a atx midtower with a 750w psu from ebay. This is the link:
http://www.ebay.com/itm/NEW-Mid-Tow...ter-Case-LED-Fan-SHARK-750w-PS-/271234472313?

Now I figure the big decision is on the cpu. I will be using this pc as a casual gamer, and making/editing and burning movies. I want it to be real good, but not too expensive. Don't really have a budget, just want to keep it reasonable.
Does anyone have a suggestion for which cpu I should get? Is the new gen of intel processors a lot better than the 3rd gen?

Any other advice for building this pc?

 

Well, I wish you came here first before buying the PSU. The PSU is one of the most important purchase decisions, but should be one of the last purchases, not first. Providing quality power is essential, and you typically don't know how much power you need until you select everything else. Plus, you want quality and efficiency by sticking with reputable brands and supplies that are 80-Plus certified. Yours is not 80-Plus certified, suggesting it does not have good, or linear efficiency. The good news is 750W "should" be plenty.

You have to set a budget. What does "reasonable" mean to you? $500 for the CPU, or $100? It may be something totally different to me, and different still from the next guy. $2000 for a good gaming machine is not unreasonable. And I could easily spend twice that and some may think that is not unreasonable. $1000 may be a budget buster for some, and totally unreasonable for others.

Better? Yes. A lot better? No. I prefer Intels but there is nothing wrong with AMD. Both will make great gaming platforms.

I first decide on the brand, then line of CPUs I want first. Then I select the motherboard that supports that line (for example, i7s). Then select a CPU that is supported by that motherboard. Then RAM, then everything else.

Set a budget. Get at least 8Gb of RAM for dual-channel motherboard, and at least 6Gb for triple. Buy a CPU listed on your motherboard's QVL (qualified vendors list). Buy RAM with the same specs as RAM listed on the motherboard's QVL. Don't forget to purchase a new Windows license for this new computer. And make sure it is 64-bit to support more than 4Gb of RAM.

Do your homework BEFORE putting the parts together. Download the installation manuals and read them while waiting delivery - paying particular attention to ESD precautions and standoff placement/motherboard mounting.

 

Agreed on the PSU, you ought to sell it on quickly and buy a good quality PSU, such as a Seasonic/XFX 550W or greater, depending really on how much of a graphics card you end up buying, some might need a 650-750W PSU to be safe - more if you go Crossfire/SLI with top cards.

For a reasonable performance at a great price, a Xeon E3 (V2 or V3) is well worth investigating, they are 1155/1150 socket CPUs and the lower ones fit between the i5 and the i7s. The one I have has pretty good Newegg reviews, worth a read: http://www.newegg.com/Product/Product.aspx?Item=N82E16819117286

 

Rather than sell it, I would keep it as a spare. Connect a PSU Tester to it and you can use to test fan and drive motors. Everyone should have a decent tester or suitable spare anyway.