Budget build help

[sidneylopsides]

Hi, I've been asked to spec a build for my other half's brother. He has up to £700 to spend, but looking to spend under that.
I have 2x4GB G.Skill 1600MHz RAM spare, so planned to give him that. If I use that does it affect the warranty in any way?

I have this so far:

Case
COOLERMASTER ELITE 130 CASE

Processor (CPU)
Intel® Core™i5 Quad Core Processor i5-4440 (3.1GHz) 6MB Cache

Motherboard
ASUS® H81I-PLUS: Mini-ITX, LG1150, USB 3.0, SATA 6GBs

Memory (RAM)
2GB KINGSTON DUAL-DDR3 1600MHz (1 x 2GB)

Graphics Card
2GB AMD RADEON™ HD7850 - DVI,HDMI,DP - DX® 11, Eyefinity 3 Capable

Memory - 1st Hard Disk
120GB KINGSTON V300 SSD, SATA 6 Gb (450MB/R, 450MB/W)

2nd Hard Disk
1TB 3.5" SATA-III 6GB/s HDD 7200RPM 32MB CACHE

1st DVD/BLU-RAY Drive
24x DUAL LAYER DVD WRITER ±R/±RW/RAM

Power Supply
CORSAIR 450W VS SERIES™ VS-450 POWER SUPPLY

Processor Cooling
INTEL STANDARD CPU COOLER

Sound Card
ONBOARD 6 CHANNEL (5.1) HIGH DEF AUDIO (AS STANDARD)

Wireless/Wired Networking
10/100/1000 GIGABIT LAN PORT - AS STANDARD ON ALL PCs

USB Options
MIN. 2 x USB 3.0 & 4 x USB 2.0 PORTS @ BACK PANEL + MIN. 2 FRONT PORTS

Power Cable
1 x 2 Metre UK Power Cable (Kettle Lead)

Operating System
Genuine Windows 7 Home Premium 64 Bit w/SP1 - inc DVD & Licence (£79)

Office Software
NO OFFICE SOFTWARE

Anti-Virus
BULLGUARD INTERNET SECURITY - FREE 90 DAY TRIAL

Warranty
3 Year Silver Warranty (1 Year Collect & Return, 1 Year Parts, 3 Year Labour) (£5)

Delivery
STANDARD INSURED DELIVERY TO UK MAINLAND (MON-FRI)

Build Time
Standard Build - Approximately 9 to 11 working days

Total £668. Would it be worth swapping to an i3 and R9 270?

 

[keynes]

Fx-6300 + r9-270x would be better.drop the SSD and get a better case