B250 vs Z270

First of all, your build os ok and will work as is.

Changes will be determined by how much you want a balanced system for now vs. what upgrades you might be looking at in the future.

Secondly is your proposed usage; I expect it is primarily for gaming since you have a strong graphics card.

A balanced gamer will normally budget 2x the cpu cost for the graphics card.
That is primarily for fast action shooters and such where graphics is all important.
For games such as sims, strategy and mmo, you want a fast single thread cpu capability.

For multiplayer, many threaded cpu is best.

To gave a good balance with a GTX1060 today, I might suggest a I3-7100@3.9.
It will play most games better than a $200 I5-7500@3.4
I5-7500 with 4 full threads might be good for multiplayer,
but for other types of games, I3 is fine.
If your games need a fast cpu, a I5-6600K would be fine, but only if you were to overclock like it is intended to perhaps the 4.5 range.
You would need a z170 or Z270 motherboard.
Actually, with the i5-7600K available in that price range, it is arguably the best gamer around.

If you go the i3 route, and might want to do a cpu upgrade in the future, I would buy a Z270 motherboard up front.
Several are available around $100.
If you go with any I3, you will get an included cooler that will do the job.
It is the K processors that require you to pick your own cooler.

Intel does not depend on fast ram. If 2400 speed is cheaper, you can go for that.
GTX1060 does not need a strong psu. It will run on most 450w units.
A GTX1080 will run on a good 520w psu.
The corsair is a tier 1 unit on this list, you can hardly do better.
http://www.tomshardware.com/forum/id-2547993/psu-tier-list.html
But in the interest of savings, tier 2 is fine, gold rated will not save you money, and modular is simply a cable management issue.
Today. there is a roaring bargain on a tier 2 Seasonic S12II 520w unit for $23.90 after a $20 rebate
https://www.newegg.com/Product/Product.aspx?item=N82E16817151094

FWIW

I will never again build without a ssd for the "C" drive. It makes everything you do much quicker.
120gb is minimum, it will hold the os and a handful of games.
But, many things default to the "C" drive.
When a SSD nears full, it will lose performance and endurance.
240gb is the recommended minimum.

If you can go 240gb, or 500gb you may never need a hard drive.

You can defer on the hard drive unless you need to store large files such as video's.
It is easy to add a hard drive later.

Samsung EVO is a good choice for performance and reliability.

I don't think that I'll upgrade my pc in the near future. This is because I don't have the money to do that.

I will use it to play games, do school work and I also might buy a drawing tablet.
The games I'll play are mostly multiplayer games like black ops, battlefield 3, rainbow six, but I will also play elder scrolls online.

Is the i3 really any good? Because I used to have an i3 laptop, and it wasn't any good at all.

Mhm, I see. I guess I'll look for a tier 2 psu.
Thanks for informing me on this!

Okay, I will se if I can get a SSD for a decent price. If I can, then i'll definitely buy one!

Z270 also allows for SLI. But it's usually better to just get a more powerful single card than an SLI configuration anyway.

I5 7500 and the Z270 would be a waste of money over the B250 unless it has a feature you want/need. The stock fan on the 7500 is plenty. Main reason to go with the Z270 is if "K" CPU for overclock and they do not come with a cooler.

A B250 motherboard will be about $80.
A Z270 motherboard will be around $110.
If you ever hope to upgrade to a K processor in the future, you will want to overclock it or you will leave some 25% performance on the table.
A I5-7600K runs at 3.8 stock.
As of 1/13/17
What percent of samples can get an overclock
at a vcore around 1.4v.
I5-7600K
5.1 28%
5.0 52%
4.9 72%

And, be careful about the ssd. Samsung evo is about the only one I trust for performance and reliability.
The 5 year warranty tells you something:
https://www.newegg.com/Product/Product.aspx?Item=N82E16820147372&nm_mc=KNC-GoogleKWLess&cm_mmc=KNC-GoogleKWLess-_-DSA-_-FeedPages-_-NA&gclid=CIqMtqn8_9MCFYdAhgodeaMMbw

And... do not go cheap on the psu, pick a tier 1 or 2 unit from a list such as this:
http://www.tomshardware.com/forum/id-2547993/psu-tier-list.html

Build in haste..... repent at leisure.