I wouldn't buy that. The only semi-worthy FX midrange card is the FX 5700 Ultra if ya ask me. I don't care how cheap it is -- that card can simply be beat by GeForce 4 TI series and for cheaper. If it were...say, $80, then I might get it.
If you truly want a GeForce FX 5600, at least get the Ultra version for a few dollars more.
*EDIT* NewEgg has the GeForce FX 5600 Ultra for $125. That TigerDirect link is a ripoff.
-Lasereth