One advantage I like about maxtor is that they actually changed over to the Fluid Bearing Design from the spindle drive motors with the ball bearing mechanism now to "liquid bearings". It is surely a promising feature to look foreword to in the future. Many faults in a hard drive usually has something to do with ball bearings; problems such as the bearings not being perfectly round, or eventually wearing out over time. However all drives will wear out as they have moving parts, however these will have a longer life span, which will certainly be good for full time servers and etc.
With the FBD, you should see in the future, faster drives as 7200 rpm is peaked with the ball bearing design. Like the new 10,000 rpm drives, however they are still needing quite a bit of developement since they only are available at 36.7GB because of design issues.
While this may not be as important for most home users who run their HDD's occaisonally, but it's still something to look for when purchasing a new HDD. However taking this into consideration, the drive may become obsolete before it wears out. Like how quickly hard drive space is really growing, but maybe considering a Serial ata HDD maybe a good idea as soon Parallel ATA will soon be phased out.
I've always noticed WD drives here being cheaper and maxtor's being the costly drive.
Hard drive coolers are a good idea, not always needed, but I have two case fans placed in the front of my computer, they work wonders for cooling. Hard drive coolers do tend to take a lot of space and seem like a good idea for a SCSI system, however if you are unable to fit any case fans blowing onto the HDD's directly, then do consider an HDD fan if you have the room for it.