Any Tips For The New Gaming Rig?

The first link, the one with the i7, is most likely more than enough for your gaming needs, although the graphics card is a bit underpowered by today's standards. The second one with the i5 isn't that great of a deal when you compare it to the one above, and I would not recommend it. While it does have a better graphics card, you get less ram and hard drive space. You may also want to consider getting something from http://www.cyberpowerpc.com/ as they are cheaper than bestbuy and offer more selection

This one is pretty darn good http://www.cyberpowerpc.com/system/CyberPower_Z97_i7_Configurator
This one is much cheaper and offers more than the second link in your post http://www.cyberpowerpc.com/system/INTEL_i5_SFF_Configurator
If you are looking to spend right around 1000$ on a pc, consider this one http://www.cyberpowerpc.com/system/Zeus_Mini-I_960

While there is nothing wrong at all with buying a pre-built pc, and there are many advantages to it, you might want to consider building your own pc. Read no further if you are just looking to buy a prebuilt pc.

The pros to building your own PC are
better choice of parts
saves money
allows you to customize every aspect
often better performance for the price

The pros of buying prebuilt are
Easy and fast to get started gaming
Comes with a warranty
No hassle

If you are interested in building your own pc, there are many useful resources.
Here is a list of the parts to build an amazing pc that is much better than the ones in your links, complete with links on where to buy them
http://pcpartpicker.com/p/Dy8y3C
In addition, you can visit
http://reddit.com/r/buildapc
http://reddit.com/r/buildapcforme
http://reddit.com/r/cabalofthebuildsmiths
To find all the information and help you will ever need on building your own pc

That being said, if you still don't want to build your own pc, this one is the best of the two, but I do NOT recommend buying from best buy, they are almost always overpriced
http://www.bestbuy.com/site/asus-desktop-intel-core-i7-16gb-memory-2tb-hard-drive-gray/9991162.p?id=1219459040379&skuId=9991162

best of luck on your choice! If you have any more questions, please ask. I am more than happy to help

If you could build your own PC and are okay with mail-in rebate I'd go with this build