If you like the looks of the P180, then get it. With the $50 you save you can get an extra case fan you put in one of the drive bays.
I have the P180 and I enjoy it, though truth be told, I don't see it all that much because it's under the desk. But, it has the two fans in the upper rear of the case for evacuating the hot air and one at the bottom for blowing over the HDs and I added a second in the middle drive bay (couldn't use it because the 8800GTX was too long) for more air movement. I have no complaints...well...one:
It is hard as hell to get the covers on or off. The tabs are plastic so you have to use caution as to not break them off.