First build 1000$, could use some advice!

The build:
[PCPartPicker part list](http://pcpartpicker.com/p/7JWXJx) / [Price breakdown by merchant](http://pcpartpicker.com/p/7JWXJx/by_merchant/)

Type|Item|Price
:----|:----|:----
**CPU** | [Intel Core i5-4670K 3.4GHz Quad-Core Processor](http://pcpartpicker.com/part/intel-cpu-bx80646i54670k) | $219.99 @ Amazon
**CPU Cooler** | [Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler](http://pcpartpicker.com/part/cooler-master-cpu-cooler-rr212e20pkr2) | $29.98 @ OutletPC
**Motherboard** | [Gigabyte GA-Z87X-UD3H ATX LGA1150 Motherboard](http://pcpartpicker.com/part/gigabyte-motherboard-gaz87xud3h) | $154.98 @ SuperBiiz
**Memory** | [G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory](http://pcpartpicker.com/part/gskill-memory-f312800cl8d8gbxm) | $81.00 @ Newegg
**Storage** | [Samsung 840 EVO 120GB 2.5" Solid State Drive](http://pcpartpicker.com/part/samsung-internal-hard-drive-mz7te120kw) | $109.00 @ Newegg
**Video Card** | [Asus Radeon R9 280X 3GB DirectCU II Video Card](http://pcpartpicker.com/part/asus-video-card-r9280xdc2t3gd5) | $268.30 @ Newegg
**Case** | [Zalman Z11 Plus ATX Mid Tower Case](http://pcpartpicker.com/part/zalman-case-z11plus) | $59.99 @ Micro Center
**Power Supply** | [XFX 550W 80+ Bronze Certified ATX Power Supply](http://pcpartpicker.com/part/xfx-power-supply-p1550sxxb9) | $55.98 @ SuperBiiz
**Optical Drive** | [Samsung SH-224DB/BEBE DVD/CD Writer](http://pcpartpicker.com/part/samsung-optical-drive-sh224dbbebe) | $14.99 @ Newegg
**Operating System** | [Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit)](http://pcpartpicker.com/part/microsoft-os-gfc02050) | $84.99 @ NCIX US
| | **Total**
| Prices include shipping, taxes, and discounts when available | $1079.20


Hey guys. After about 6-7 years of using the same computer, Ive finally decided its time for an upgrade Heres a direct link to my hypothetical build. http://pcpartpicker.com/user/Hevol/saved/GphmP6

I will be using this computer mainly for gaming. As you may notice, I wasnt planning on buying another HDD (since I will be getting an SSD), so Im fine with using my old HDD just for storage. A question that i have is: is this a mistake? Will my pc run slower when using an old hdd (but saving all my games, os etc on the ssd)?

Another thing: will this 550w Psu be sufficient for my build? Ive never done OCing before but I might try it later!

And finally: is the cooler I was thinking of purchasing good enough for this setup?
Thanks in advance for all your responses and have a nice semi-final!