It seems like the only things you could salvage are the RAM, CPU, and drives. Still, that's a great start.
Let me figure something out. You can call Microsoft and ask them about transferring the OS and whatnot.
Use that link and its discounts to get a R9 390 from jet, a yahoo subsidiary, for $250.
PCPartPicker part list / Price breakdown by merchant
| Type | Item | Price |
|---|---|---|
| CPU | Intel Core i7-4790 3.6GHz Quad-Core Processor | Purchased For $0.00 |
| CPU Cooler | Cooler Master Hyper TX3 54.8 CFM Sleeve Bearing CPU Cooler | $13.99 @ Newegg |
| Motherboard | ASRock H97 Anniversary ATX LGA1150 Motherboard | $67.98 @ Newegg |
| Storage | Samsung 850 EVO-Series 250GB 2.5" Solid State Drive | $84.88 @ OutletPC |
| Video Card | MSI Radeon R9 390 8GB Video Card | $250.00 |
| Case | NZXT S340 (White) ATX Mid Tower Case | $63.99 @ SuperBiiz |
| Power Supply | EVGA SuperNOVA GS 650W 80+ Gold Certified Fully-Modular ATX Power Supply | $75.98 @ Newegg |
| Other | Generic 16 GB DDR3 RAM | Purchased |
| Prices include shipping, taxes, rebates, and discounts | ||
| Total (before mail-in rebates) | $596.82 | |
| Mail-in rebates | -$40.00 | |
| Total | $556.82 | |
| Generated by PCPartPicker 2016-01-04 12:40 EST-0500 |