Ultima 9650i Laser" Intel Core i7 3770K 4.5GHZ

Dont giv me warnings gamespot on how many topics im posting lately lol.

Any way going to phone overclockers in next few days or hopefully tonight if get time to change some of these parts. Im thinking of getting this PC from them.

Ultima 9650i Laser" Intel Core i7 3770K 3.50GHz @ 4.50GHz DDR3 Ivybridge System

System Specification

- Case: Corsair Carbide 500R Case - Black (default choice, options avalable)
- Power Supply: OCZ ZS 750w PSU
- CPU: Intel Core i7 3770K 3.50GHz @ 4.50GHz Ivybridge CPU
- Motherboard: Gigabyte Z77X-UD5H Intel Z77 (Socket 1155) DDR3 Motherboard
- Cooler: Prolimatech Genesis CPU Cooler w/ x3 Sharkoon Silent Eagle Fans
- RAM: Corsair Vengeance 16GB DDR3 1600MHz Dual Channel Kit
- Hard Drive: 1TB HDD
- Graphics Card: ATI Radeon HD 5450 SILENT 512MB (default choice, options available)
- Sound: Asus Xonar DG 5.1 Sound Card
- Optical Drive: Samsung SH-B123L/BSBP 12x BluRay ROM / 16x DVD±RW Lightscribe SATA-II Optical Drive - Black

Im thinking of changing some parts.

CASE: Corsair Carbide 500R Case - Black (default choice, options avalable) Change to

CASE: BitFenix Shinobi XL Case

POWER SUPPLY: OCZ ZS 750w PSU Change to.
PWER SUPPLY: Antec High Current Pro 850W Modular '80 Plus Gold' Power Supply

CPU: Intel Core i7 3770K 3.50GHz @ 4.50GHz Ivybridge CPU Keep
CPU: Intel Core i7 3770K 3.50GHz @ 4.50GHz Ivybridge CPU

MOTHERBOARD: Gigabyte Z77X-UD5H Intel Z77 (Socket 1155) DDR3 Motherboard Not sure was thinking downgrade to
MOTHERBOARD: Gigabyte Z77X-UD3H Intel Z77 (Socket 1155) DDR3 Motherboard ??

COOLER: Prolimatech Genesis CPU Cooler w/ x3 Sharkoon Silent Eagle Fans Not sure was thinking changing to.
COOLER: Alpenföhn K2 Mount Doom CPU Cooler (Socket LGA1156/1155/1366/AM2/AM2+/AM3/AM3+/FM1)

RAM: Corsair Vengeance 16GB DDR3 1600MHz Dual Channel Kit change to
RAM: Corsair Vengeance Low Profile 8GB (2x4GB) DDR3 PC3-12800C9 1600MHz Dual Channel Kit

HARD DRIVE: Hard Drive: 1TB HDD
HARD DRIVE: Seagate Barracuda 2TB 7200RPM SATA 6Gb/s 64MB Cache - OEM

SSD DRIVE: Sandisk Extreme SSD 120GB 2.5" SATA 6Gb/s Solid State Hard Drive

GRAPHIC CARD: ATI Radeon HD 5450 SILENT 512MB (default choice, options available) Change to
GRAPHIC CARD: MSI GeForce GTX 670 OC 2048MB GDDR5 PCI-Express Graphics Card

Sound: Asus Xonar DG 5.1 Sound Card

Optical Drive: Samsung SH-B123L/BSBP 12x BluRay ROM / 16x DVD±RW Lightscribe SATA-II Optical Drive - Black

are these good changes to make?. If its less then or same as the price advertise i will buy if you say go for it. But please tell the truth lol.