yah you can get better than that but you can also but 4770 and wait til you can buy a new board for cross fire.why! I say.think of the future upcoming games you think your 4890 can still perform at its best and at a price of 190$ while you can get 2 4770 and at a range of 210$ less and stiil cope up in the near future having all the specs of a single card at times 2 greatr than a single card 4890 with almost the same price.
Pentium 4 3.4\
Gigabyte G31m-Es2c\
DDR2 4GB\
ATI 4770 512\
PSU Huntkey 600W\