Need a new graphics card for an old system

1. What is the intended use for this graphic card ? Gaming or workstation work? (Name few Games or applications are you going to run)
Ans: Mostly Gaming. Use it to run games like Fifa, LoL, Rocket league etc. Don't really run the higher end games.

2. Which Power Supply do you have? (Be EXACT while naming the company and model)
Ans: Corsair CX 430

3. What is your Max budget ?
Ans: 7-10k, would prefer a cheaper one though, as I might end up getting a new system soon (half a year-1 year)

4. Which Screen resolution will you game at (if applicable)?
Ans: 1920*1080

5. What are your current computer specifications ?
Ans: i3 3220, 8 GB RAM Ripjaws, Gigabyte B75m-D3H mobo

I had a Sapphire HD 7770, but it died about a couple of weeks ago. This system is around 2.5 years old, and I don't wanna purchase a new system for some time as I already have a decent Laptop (Lenovo y50) and will probably be moving this year in July/August. Mostly use this system for gaming with my brother.

Should I just go for an old second hand graphics card? Or a low end one (~4k). Or get a like for like replacement?

Thanks!