If you want to overclock, you'll also want to upgrade to a Z97 motherboard (instead of the H97), because they handle overclocking much better. Then, if you actually want to overclock, you'll need a good aftermarket CPU cooler (although that wouldn't need to be purchased until you actually start overclocking).
Something like this:
PCPartPicker part list / Price breakdown by merchant
| Type | Item | Price |
|---|---|---|
| CPU | Intel Core i5-4690K 3.5GHz Quad-Core Processor | $224.95 @ SuperBiiz |
| Motherboard | ASRock Z97M Anniversary Micro ATX LGA1150 Motherboard | $88.99 @ SuperBiiz |
| Memory | GeIL EVO POTENZA 8GB (2 x 4GB) DDR3-1600 Memory | $53.98 @ Newegg |
| Storage | Crucial MX100 128GB 2.5" Solid State Drive | $64.95 @ SuperBiiz |
| Storage | Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive | $53.99 @ NCIX US |
| Video Card | XFX Radeon R9 290 4GB Black Edition Double Dissipation Video Card | $289.99 @ Amazon |
| Case | Cooler Master N200 MicroATX Mid Tower Case | $39.99 @ NCIX US |
| Power Supply | EVGA 500W 80+ Bronze Certified ATX Power Supply | $42.99 @ SuperBiiz |
| Prices include shipping, taxes, rebates, and discounts | ||
| Total | $859.83 | |
| Generated by PCPartPicker 2015-03-06 11:02 EST-0500 |
and add the CPU cooler when you can.
I'm not really sure what the price to performance benefit is, so hopefully someone else can help with that.