Looking at purchasing some drives

[kharan5876]

In about a month I am going to buy about 9 drives and am trying to consider what to go for. I will be putting them in the norco 4220 using raidz2 (zfs software raid 6). I had a couple of questions.

First about capacity. I heard before that there were issues with the 1.5tb and 2tb models.
Is this still the case? Would it be safer to just stick with the 1tb drives? I want my drives to last as long as possible.

Also the issue of desktop drives vs enterprise drives. With the western digital drives in partiticular, is there any real difference between using a desktop drive (green or black) and enabling TLER vs buying expensive enterprise drives?

Finally another consideration is the power usage. This is going to be on 24x7 so I'd like to minimize power consumption as much as possible.
I can enable TLER but there is also a problem I hear with head parking and smart errors. Is there a way around this? Someone here said that http://www.hardforum.com/showthread.php?t=1420109 the newer drives do not report the head parks to smart.

Has anyone played with the seagate LP or the samsung EcoGreen drives?