Midrange Gaming rig, £800 budget, Any improvement/Price cuts?

[MexicanPombear]

.Asus Nvidia GeForce GT 620 Graphics card
.Hp DVD1260I Internal DVD Re-writer
.Corsair CMZ8GX3M2A1600C9 8GB 2 Module RAM kit
.Sharkoon Drakonia Gaming mat
.CoolerMaster Hyper 212 EVO
.Asus P8Z77-V LX Motherboard
.Norton Internet Security 2013 - 3 Com's, 1 year
.Microsoft Office Home and student 2013, 1 user
.Windows 7 Home premium, 1 User
.Dell TactX Alienware USB Gaming keyboard (UK layout)
.Sharkoon Drakonia Mouse
.Samsung S22B370BS 21.5 inch Widescreen LED monitor
.Intel 3rd gen core i5-3570k CPU
.Western Digital Caviar Blue 500GB SATA3 6Gb/s Internal Hard Drive OEM
.CiT Vantage Midi Mesh Gaming Case
.650W PC PSU, 12cm Silent Fan, SATA, 24 pin power, V2.2, Gold Edition power supply

Is this any good? I wanna play Minecraft, Planetside 2, Skyrim, maybe Crysis 3 eventually, is there anyway I can cut the price without making a major performance difference(excluding the peripherals)? Anyway to make a decent upgrade without getting very expensive equipment?
Thanks in advance

 

[The Incinerator]

Intel Core i5 3570K - Rs 13700
Gigabyte GA-Z77X-UD3H - Rs 12000
Gskill 8GB RAM F3-12800CL9D-8GBXL- Rs 2750
GPU - GTX 660Ti / Sapphire HD 7870 - Rs 19700 /16500
HDD - WD Caviar Blue 2TB - Rs 5400
SMPS - Corsair CX500V2 - Rs 3450
Cabinet - NZXT Beta EVO/Source 210 - Rs 2600
OPD - Samsung SH-S 223F - Rs 975
Monitor - Dell S2240L (21.5 inch LED Full HD 1920 x 1080) - Rs 9000

Total
Rs 66,375

You will get all of them in and around Tottenham Court Road. So happy Hunting.