yeah, well, i think it is normal for your system to act at this temperature while running.
i, too, have similar problem.
my system set up:
p4 3.06 ht
GA-8INXP motherboard
1gb ddram
asus 9800xt@256 ram vga.
the programmes i run are archicad 8, 8.1, art-lantis4.5, photoshop.
idle: 45-50 deg C
load: 65-70 deg C.
pretty terrible until i use water cooling from cosair hydrocool.
as for the workstation, fan cooled, normal temp like yours.
hope these will help.