BZeto,
ChefJoe has a good point; if you have a case such as an Antec SX630/830/1030, etc. the hard drives in these cases mount into a removeable HD cage. This cage assembly allows for the installation of an 80mm case fan to draw air in from the front of the case blowing cool air across the HDs.
The Vantec HD cooling assembly that I mentioned does a slightly better job in my opinion; the fans are mounted on an aluminum assembly that attaches directly onto the lower part of the HD. It acts as a heat sink and literally sucks the hot air away from the controller board. Since I only use one HD, I have it mounted in the top part of the HD cage assembly in my Antec case. I can easily add another HD below it with another Vantec cooler if I chose to do so. Also, this Vantec is very quiet; on or off I can't tell the difference.
Any of these methods should more than help keep the HD and the controller board cool. In either case, the cost is minimal. I will use these coolers from here on out in every system that I put together.
As for IBM HDs having problems, if you search this forum (read the FAQ regarding the IBM 75GXP series) and other web site forums, you'll see that the bulk of the problems revolve around the 75GXP series. A few have mentioned problems with the 60GXP but I haven't heard anything bad about the 120GXP line as of yet. Mine lasted 2.5 years before dying, definitely premature. We have a ton of the 60GXPs at work and I haven't heard of any problems with them from our IT dept.
Maxtor is good, so is WD, and Seagate. I mentioned earlier that I happened to buy a Seagate Barracuda IV that crapped out one week after buying it! It was very quiet and about as fast as my 75GXPs. The 120GXP seems to be faster and quieter than either and a very good drive at that...