Gaming PC?

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Hi guys, I'm looking for a gaming/schoolwork PC for under £800, including monitor. The spec I've managed to come up with is:
Case
STYLISH PIANO BLACK ENIGMA MICRO-ATX CASE + 2 FRONT USB

Processor (CPU)
Intel® Core™i5 Quad Core Processor i5-3470 (3.2GHz) 6MB Cache

Motherboard
ASUS® P8Z77-M: MICRO-ATX, USB 3.0, SATA 6GBs, ATI®CrossFireX

Memory (RAM)
8GB SAMSUNG DUAL-DDR3 1333MHz (2 X 4GB)

Graphics Card
1GB NVIDIA GEFORCE GTX 550 Ti - DVI, HDMI, VGA - 3D Vision Ready

Memory - 1st Hard Disk
500GB 3.5" SATA-III 6GB/s HDD 7200RPM 16MB CACHE

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

Memory Card Reader
INTERNAL 52 IN 1 CARD READER (XD, MS, CF, SD, etc) + 1 x USB 2.0 PORT

Power Supply
450W Quiet 80 PLUS Dual Rail PSU + 120mm Case Fan

Processor Cooling
INTEL SOCKET LGA1155 STANDARD CPU COOLER

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

Network Facilities
WIRELESS 802.11N 300Mbps PCI CARD (£16)

USB Options
6 x USB 2.0 PORTS @ BACK PANEL (MIN 2 FRONT PORTS) AS STANDARD

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

Office Software
FREE Microsoft® Office Starter 2010 (Limited functionality Word & Excel)

Anti-Virus
BULLGUARD INTERNET SECURITY - FREE 90 DAY TRIAL

Warranty
3 Year Standard Warranty (1 Month Collect & Return, 1 Year Parts, 3 Year Labour)

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

Build Time
Standard Build - Approximately 10 to 12 working days

This seems fine to me, but I had a few questions:
1) Would it be better to get an AMD processor, and improve the graphics card to the 560/Ti?
2) Should I get an Nvidia graphics card or an AMD?
3) What size monitor should I get?
Thanks.

 

[keynes]

Would it be better to get an AMD processor, and improve the graphics card to the 560/Ti?

For your budget including a monitor I'd consider an AMD CPU and upgrade the graphics card. A caviar black is a faster HDD than the one you selected and the HD 7850 will give you better gaming performance than the GTX 560 ti.

Case
PCS MAELSTROM T900 BLACK GAMING CASE
Processor (CPU)
AMD BULLDOZER QUAD CORE FX-4170 (4.20GHz/4MB CACHE/AM3+)
Motherboard
ASUS® M5A78L-M/USB3 (M-ATX, DDR3, USB 3.0, 3Gb/s)
Memory (RAM)
4GB SAMSUNG DUAL-DDR3 1333MHz (2 X 2GB)
Graphics Card
2GB AMD RADEON™ HD7850 - DVI,HDMI,2 mDP - DX® 11, Eyefinity 4 Capable
Free Item
FREE DIRT SHOWDOWN GAME with any AMD 7000 Series GPU!
Memory - 1st Hard Disk
500GB WD CAVIAR BLACK WD5002AALX, SATA 6 Gb/s, 32MB CACHE (7200rpm)
1st DVD/BLU-RAY Drive
24x DUAL LAYER DVD WRITER ±R/±RW/RAM
Power Supply
450W Quiet 80 PLUS Dual Rail PSU + 120mm Case Fan
Processor Cooling
SUPER QUIET 22dBA TRIPLE COPPER HEATPIPE AMD CPU COOLER (£19)
Sound Card
ONBOARD 8 CHANNEL (7.1) HIGH DEF AUDIO (AS STANDARD)
Network Facilities
10/100/1000 GIGABIT LAN PORT - AS STANDARD ON ALL PCs
USB Options
6 x USB 2.0 PORTS @ BACK PANEL (MIN 2 FRONT PORTS) AS STANDARD
Operating System
Genuine Windows 7 Home Premium 64 Bit w/SP1 - inc DVD & Licence
Office Software
FREE Microsoft® Office Starter 2010 (Limited functionality Word & Excel)
Anti-Virus
BULLGUARD INTERNET SECURITY - FREE 90 DAY TRIAL
Monitor
AOC 21.5" WIDESCREEN LED TFT - 1920 x 1080, 5MS, D-Sub, DVI-D (£89)
DVI-D & HDMI Monitor Cables
1 x 2 METRE DVI-D CABLE (£5)
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 10 to 12 working days
Quantity
1

Price: £797.00 including VAT and delivery.

Unique URL to re-configure: http://www.pcspecialist.co.uk/quotes/amd-bulldozer-top-spec-pc/a4bpukqnH8/

 

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Looks good, although I also need(forgot to mention this, sorry):
Keyboard/Mouse
Wireless Card
Also is it worth getting 8GB of RAM instead of 4?

 

[keynes]

Looks good, although I also need(forgot to mention this, sorry):
Keyboard/Mouse
Wireless Card
Also is it worth getting 8GB of RAM instead of 4?

I rather put more emphasis in the GPU and CPU, you can always add more ram later on.

 

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Ok, that's fine. Just one(hopefully last) question-does the case really matter, ie. can I downgrade it to the coolermaster elite, in order to fit in the cost of the keyboard/mouse and the wireless card.
Thanks.

 

[keynes]

can I downgrade it to the coolermaster elite, in order to fit in the cost of the keyboard/mouse and the wireless card.

You could downgrade the case. The T900 should provide better cooling and airflow since it is slightly bigger and comes with more chassis fans than the 310 elite.