Core i5 2500

i have an old dell optiplex 990 with core i5 2500(3.3ghz), 4 gigs ram(1333mhz). 06D7TR motherboard and psu 265w,, please suggest a decent gpu with sufficient vram, which components need to upgrade to avoid bottle neck , i have a budget of 150$ to 180$. thanks in advance.

Hello, First my PC Specs: Computer Type: Desktop, custom-built. Mainboard: Gigabyte GA-Z77X-UD3H PSU: COOLERMASTER GX LITE 600W GPU: Gigabyte GTX 1070 Founders Edition CPU: Intel i5-3450 (Ivy Bridge) RAM: 8GB HyperX genesis OS: Windows 10 Nothing overclocked. Bios is updated to the last version...