Need a budget build under 600

[marxman224]

Approximate Purchase Date: e.g.: Within these two weeks.

Budget Range: 600 Before anything

System Usage from Most to Least Important: Gaming, Internet.

Are you buying a monitor: maybe

Parts to Upgrade: New system

Do you need to buy OS: Yes

Preferred Website(s) for Parts: Newegg, Best Buy, Amazon.

Location: Central new Jersey.

Parts Preferences: by brand or type Intel, Nvidia, West. Digital, Samsung, Asus.

Overclocking: Maybe

SLI or Crossfire: N/A

Your Monitor Resolution: Currently 1600x900, considering upgrading to 1920x1080

Additional Comments: Best bang for the buck

Why Are You Upgrading: Old 4 year old Office computer with a GTX 750 ti slapped into it. It's
about to die pretty soon.

UPDATE
I have a 750 TI I would like to use, unless a more powerful card can be put into the build w/o killing the budget.

 

[JackNaylorPE]

Using the old 750 Ti ... you can upgrade as time goes on ... PSU will handle twin 970s

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-4690 3.5GHz Quad-Core Processor ($214.99 @ SuperBiiz)
Motherboard: Gigabyte GA-H97N-WIFI Mini ITX LGA1150 Motherboard ($109.99 @ Micro Center)
Memory: Mushkin Redline 8GB (2 x 4GB) DDR3-2133 Memory ($49.99 @ Newegg)
Storage: Seagate 2TB 3.5" 7200RPM Hybrid Internal Hard Drive ($89.88 @ OutletPC)
Case: Phanteks Enthoo EVOLV ITX Mini ITX Tower Case ($64.99 @ Newegg)
Power Supply: EVGA 750W 80+ Bronze Certified Semi-Modular ATX Power Supply ($59.99 @ NCIX US)
Total: $589.83
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-07-18 15:09 EDT-0400

 

[marxman224]

Budget has changed to 500. Any suggestions? Sorry.