Hi newcomer and welcome to the Tom's hardware forum.
I would get the 1st option, 'cause have an ATI 5770 that is much better that the 9800GT. Also, have DDR3 against DDR2 of the 2nd option. The HDD is a litte more big.
Also, the 1st option is a quad-core against a dual-core, and the 620 can OC 20% or 30%, so, you can get 3.2GHz without problems.
Now, my question. What is the price of the rig?