Need help with decision to upgrade or build new system

[Shaft_32]

For reference, this is what I bought almost 4 years ago:
Old system
Since then, I purchased a 240GB SSD.

So, here is the situation. My PC is very popular in my house, enough so that I'm debating whether to upgrade or just get a new PC(and keep the old one around for the kids). I would like to get some advice on how much improvement I would see in an upgrade vs a new system.

Here are my chief complaints about current system in order of importance:
- SSD space. Hard to go back to HDD, though it is nice to have the extra storage for movies, music, etc. However, I install new games to the SSD and it gets full quick. 500GB would be a lot nicer.
- Video card performance. I have had ups and downs with the 560 Ti. Had to send it back after 2 years and got it fixed. The thing just went dead. They did fix the card(vs giving me a new one), and it has been holding up ever since. I play on 1080 resolution, and I am starting to have to bump detail to medium on games like Far Cry 4.

I don't know if my 2500K CPU is getting taxed or not. It is still stock.

I have been looking at a 500GB SSD and GTX 770 video card as a potential upgrade.
http://pcpartpicker.com/part/gigabyte-video-card-gvn770oc2gd
http://pcpartpicker.com/part/mushkin-internal-hard-drive-mknssdcr480gb7

For a new system, my budget would be about $1000 without monitor. From my last build, I have learned that:
- overclocking is not really my bag. I will probably leave CPU at stock one way or another
- SLI never panned out and I am not sure if this needs to be an option for my next build.
- consequently my case was huge, my PSU was way too much, etc.
- my 560 Ti was overclocked and I think this caused issues with overheating on some games(far cry 3 and battlefield 4 were two memorable ones) Would like to avoid that in the future.

Any help making this decision is appreciated.

 

[Eximo]

No reason to upgrade an i5-2500k. Even at stock it is still a highly regarded chip. Though with little effort you can overclock it to a more contemporary speed. Many people managed 4.8Ghz. You could try for 4.3 or something and should be quite easy to get working.

GTX970 would be a wiser investment then a GTX770. About $50 more though.

There are cheaper 512GB SSDs out there. They are all fairly fast, but do you want maximum performance or maximum storage?

 

[Shaft_32]

Storage is what I'm looking for. My reasoning is that the jump from HDD to SSD is significant enough that I don't need the extra "Oomph" from a faster SSD. Also keep in mind I don't know what I'm talking about, so I could be very misguided.

 

[Moonstick2]

If it were me, I'd definitely keep what you have and update the graphics card and SSD.

You're right in my opinion, in that the differences between SSDs are nowhere near the differences between HDDs and SSDs.

Rebuilding is a hassle (though can be a fun hassle!), and you're not going to greatly improve on your other parts. Plus the large case and PSU suddenly look like an investment!

 

[Eximo]

I would almost go for the Crucial MX100 512GB drive just so that you end up with the larger formatted space over a 480GB drive. A tiny bit faster too.

http://pcpartpicker.com/part/crucial-internal-hard-drive-ct512mx100ssd1

GTX970 Gigabyte Windforce

http://pcpartpicker.com/part/gigabyte-video-card-gvn970wf3oc4gd