Base Computer with future upgrades. Help Please!

The links are broken.

I would recommend you change the CPU. I'm not saying the i5 2500 is bad, but it's not good, the i5 2500k, on the other hand, is absolutely terrific. If you aren't going to overclock, then go with the intel i5 2400 since it gives similar performance as the i5 2500 but is $20 cheaper:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

I would use the $20 saved to go with the ASRock extreme 3 z68 motherboard:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
It is similar to the PRO3 but has 2 PCIe 3.0 slots rather than one, meaning it supports CF and SLI, which you may want to consider in the future.

G.Skill is a great RAM company, but you can save some money on the RAM and go with this RAM kit instead:
Team Elite 8GB Memory Model TED38192M1333HC9DC
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

You're also overkilling on the power supply. You would probably not need that power supply, instead of buying a $120 PSU, get the $70 Seasonic 620W PSU:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

With the money saved, you can go with a gtx 570 instead of the gtx 560Ti for a better gaming system.

Basically I am looking for a base computer that I can get and put the upgrades in it when I get them? any advice

The above recommendations are perfect because:
1. The motherboard allows for more RAM in the future, SLI/CF the gfx card, and also upgrade to an overclockable CPU
2. The 620W PSU is more than enough to handle future upgrades.

I really can't see how that isn't "upgradeable." You have to also realize that you won't really be able to upgrade that computer after 2-3 years since ALL the components will probably be outdated except for maybe the PSU and the HDD and case.

I'm talking about buying just a regular desktop computer from a store that is going to be able to have these upgrades put in it.

Why do that when you want the Antec 300 case? Why not just save the money and get the components. In the long run, you'll be spending less on these components than upgrading a pre-build PC.

It was just a thought I don't have to have it. I don't care what the case looks like honestly

^^solid advice - per-built is rarely as good as quality components you pick yourself.
-Bruce

I just want to play diablo 3 and I have a 13 inch macbook pro and I highly doubt its going to be able to run it

In that case, you want to build a system that can run diablo 3, not upgrade a pre-built system, since they tend to cost higher and have bad performance.
I'll use the recommended specs section:
http://us.battle.net/support/en/article/diablo-iii-syst...

CPU: AMD FX-4100 $110
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
I know there has been lots of "This CPU sucks this and that" but people aren't realizing that this CPU is magical for the price it is at, yes the i3 2100 is better, but it's also $15 more expensive as of now.

Graphics: SAPPHIRE 100314-3L Radeon HD 6870 $164
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
This is a great graphics card that'll last a while. You won't be stopped by any modern game titles whatsoever.

MoBo: ASUS M5A78L-M LX $60
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
This is a decently priced AM3+ board with lots of features. It has somewhat of a bad review, but also realize that most of the reviews aren't detailed at all.

PSU: OCZ ModXStream Pro 500W $65
'http://www.newegg.com/Product/Product.aspx?Item=N82E168...
This is a great modular power supply. It is 80+ certified and is reliable.

Case: NZXT Gamma $40
http://www.amazon.com/GAMMA-Classic-Interior-Chassis-Bl...
This is a great case that was designed for gaming systems. It supports 10+" graphics cards and is extremely affordable.

HDD: Seagate Barracuda ST500DM002 500GB $85
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
This is a great HDD for the price and is also a pretty decent 500GB drive. It is also decently priced.

RAM: Team Elite 8GB (2 x 4GB) Memory Model TED38192M1333HC9DC $36
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
This is a great RAM bundle. 8GB is more than overkill, my gaming system rarely uses more than 3GB of RAM, so if you want to save money, go with a 4GB RAM bundle

Heatsink+Fan: STOCK $0

DVD-ROM: LITE-ON DVD Burner - Bulk 24X $18
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Nothing much to say about it. The typical DVD burner for DVDs and Windows installation.

Total: $578
This can be easily made cheaper and still run Diablo 3 with the highest settings at good frame rates, however, this was a build that was meant to last some time. There are a few rebates/discounts that will bring the overall cost of the system closer to $525

I really prefer intel. Can I still get the i5 2500 and use the other parts. I don't mind spending the extra for that considering I would probably upgrade to it anyway.

That's fine. However, go with either the i5 2400 if you aren't going to OC or with the i5 2500k if you are.
If you go with an Intel build, you'll have to buy an LGA1155 motherboard such as the ASRock H61M-VS:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
or the ASRock Extreme 3 Z68:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

ok thanks