7750 + 3870 vs X3 710 + 4830 ?

I can’t decide on two options: pls help

  1. Amd 7750 BE + 770/780 chipset + 3870 + 2x2gb 800mhz cl5
  2. Phenon II 710 + 790gx chipset |+ 4830 + 2.2gb 1066mhz cl5

Both have 2x samsung 500 gb 7200 rpm 16mb buffer in raid 0.

I use this computer for medium gaming, hard downloading ( and therefore multitasking ) and hd movies on a 32" lcd screen.

The second configuration in 33% more expensive. Do i get 33% more performance? Or is it better just to upgrade sooner from the first one?

My current config is 4000+, 2600Xt and 2gb 800 cl5 ram, so i think both will be a great upgrade.

Please let me know what do you think.

PS: I would like to try overclocking just for the fun of it ( but the 720 BE is more expensive ).

the 4830 is better but i have the 3870 with a e5200 and its amazing