Please review my selected components for a AMD based computer.

Hi everybody, http://img.tomshardware.com/forum/ [...] /icon7.gif

I am new to the site. I want to upgrade my computer to a AMD based one. Please review listed components and let me know if I'm ordering incompatable parts or over/under doing anything. I'm basically trying to build a mid range gaming machine that can play all current games without highest settings and will be somewhat future proof. Opinion/suggestion on the listed components would be greatly appreciated. I am little confused about the motherboard (780g or 790x) & graphics card (4830 or 4850). I can stretch my budget a bit if necessary.

CPU:
Athlon x2 7750 (2700mhz) black edition

MEMORY:
2 x 2gb kingston ddr2 1066mhz

SPEAKER:
Creative inspire T6200

SOUND CARD:
Creative PCI Express X-Fi Xtreme Audio
Asus Xonar DX PCI Express

MOTHERBOARD:
Gigabyte GA-MA790X-UD4(rev. 1.0) without g/card
Gigabyte GA - MA78G – UD3H (rev 1.0)
Gigabyte GA - MA78G - DS3H (rev 2.x)

GRAPHICS CARD:
MSI R4830-T2D512-OC
Palit Radeon HD4830
Palit Radeon HD4850 Sonic
Asus 4850 MATRIX/HTDI/512M (heat problem !!)

Cooling: Do I need any extra fans/heatsinks?

Thanks!!

Phenom II is too much costly for me. reason for choosing 7750 is given below: -

Athlon 64 X2 7750
Core Kuma
Operating Frequency 2.7GHz
Hyper Transports 3600MHz
L1 Cache 2 x 128KB
L2 Cache 2 x 512KB
L3 Cache 2MB
Manufacturing Tech 65 nm
Thermal Power 95W

Athlon 64 X2 6400+
Core Windsor
Operating Frequency 3.2GHz
Hyper Transports 2000MHz
L1 Cache 2 x 128KB
L2 Cache 2 x 1MB
L3 Cache -
Manufacturing Tech 90 nm
Thermal Power 125W

Athlon 64 X2 6000+
Core Brisbane
Operating Frequency 3.1GHz
Hyper Transports 2000MHz
L1 Cache 2 x 128KB
L2 Cache 2 x 512KB
L3 Cache -
Manufacturing Tech 65 nm
Thermal Power 89W

lastly 7750 also supprots ddr2 1066mhz

will pairing it with ddr2 1066mhz improve the performance ?

1. Clock for clock the x2 7750BE is the way forward and runs cooler!


2. My suggested cheapo rig around x2 7750BE


3. I have built rigs off TSeries Biostars: peeps alien to OCing have used the software to get anywhere from 300-600mhz

The selected gigabyte m/boards support hybrid crossfire. If I use 3470 with integrated graphics of the m/board instead of purchasing a relatively costly 4830, would it serve my purpose of playing all current games without highest settings? or should I choose Gigabyte GA-MA790GP-UD4H (rev. 1.0) motherboard with side port memory for hybrid crossfire? Will side port memory help? I have a 19" monitor.

Thanx buddy.