I've purchased the P183 to replace my P180, and I built my girlfriend's computer with a P182, so I've had a bit of experience with all three models.
My rig has a Q6600 cooled with a Tunic Tower, a 850W Enermax 85+ PSU, GTX 275 vid card. Two hard drives in the bottom chamber.
The 183 is indeed noisier than the P182, and that was obviously the cost for getting more ventilation. I have yet to replace the top TriCool with another Scythe S-Flex E @ 5V (all my other fans are Scythe E and they're connected to a fan controller set to the lowest voltage).
One advantage of the P183 is the location of the bottom chamber fan, which allows for large/long PSUs.
If you're building a gaming rig with a large PSU, I'd suggest you go with the P183.
If you're not into large PSUs and extra cooling isn't needed, the P182 will be quieter.
Might I ask *how* much noisier the P183 is compared to the P182?
I'm torn between those two cases (and the Lancool K10, to be honest
I like the looks of the P182 more than the looks of the P183, but I'll be putting something along the lines of a GTX275 in it. I'm getting the impression from searching this forum that the P182 has some serious airflow problems and I *WANT* to keep the case door closed. As much for noise as for aesthetics.
It seems every time I decide on one of the models some piece of info turns up that makes me question my choice. I should add that I'm not much of a modder.