Keep the card reader, the DVD player, the hard drive, and power supply if you upgraded it to the 500W IIRC.
Everything else you'll definitely want to get new as it's too old to work with.
Here's a budget i5 build. I tried my best to make it sub 500 without making poor part decisions.
PCPartPicker part list / Price breakdown by merchant
CPU: Intel Core i5-4460 3.2GHz Quad-Core Processor ($222.50 @ shopRBC)
Motherboard: MSI H81M-P33 Micro ATX LGA1150 Motherboard ($58.25 @ Vuugo)
Memory: G.Skill Ripjaws X Series 8GB (1 x 8GB) DDR3-1333 Memory ($64.05 @ DirectCanada)
Video Card: Club 3D Radeon R9 270 2GB '14Series Video Card ($179.99 @ NCIX)
Case: Fractal Design Core 1500 MicroATX Mini Tower Case ($39.99 @ NCIX)
Other: salvaged hard drive
Other: salvaged dvd drive
Other: salvaged psu
Total: $564.78
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-04-23 15:51 EDT-0400
For a long term computer, you're better off spending the money on the i5 now instead of compromising with an APU that will bottleneck modern games. But switching to an AMD FX 6-core or an AMD APU+removing GPU are your two options to make it cheaper.
The i5 is a fantastic chip. I have a 4 year old i5 on an second computer and it runs like a champ in games.
If you want to compromise on the GPU, drop it to a 260X.
Everything else you'll definitely want to get new as it's too old to work with.
Here's a budget i5 build. I tried my best to make it sub 500 without making poor part decisions.
PCPartPicker part list / Price breakdown by merchant
CPU: Intel Core i5-4460 3.2GHz Quad-Core Processor ($222.50 @ shopRBC)
Motherboard: MSI H81M-P33 Micro ATX LGA1150 Motherboard ($58.25 @ Vuugo)
Memory: G.Skill Ripjaws X Series 8GB (1 x 8GB) DDR3-1333 Memory ($64.05 @ DirectCanada)
Video Card: Club 3D Radeon R9 270 2GB '14Series Video Card ($179.99 @ NCIX)
Case: Fractal Design Core 1500 MicroATX Mini Tower Case ($39.99 @ NCIX)
Other: salvaged hard drive
Other: salvaged dvd drive
Other: salvaged psu
Total: $564.78
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-04-23 15:51 EDT-0400
For a long term computer, you're better off spending the money on the i5 now instead of compromising with an APU that will bottleneck modern games. But switching to an AMD FX 6-core or an AMD APU+removing GPU are your two options to make it cheaper.
The i5 is a fantastic chip. I have a 4 year old i5 on an second computer and it runs like a champ in games.
If you want to compromise on the GPU, drop it to a 260X.