Yea, I tend to agree to go with the business lines over the home lines.....however with the 800+ we buy annually (split between Dell and HP), I have seen a disturbing trend of mix quality components or even just different components between purchases. I know the margins are getting tough...but perhaps it is because we are gov't contract purchasers and getting at a lower rate to begin with.
You won't see that as much with HP as you do Dell. Dell purchases a little different. Although they have "one" lines thats' supposed to stay the same component wise for the life of the model.
HP typically has a cycle rate of about 6 months. The parts rarely change through that cycle if ever. Take the Elite 8000 for example. There are two types, the normal and what they call "smart buys". There my be 15 different skues of that model, of which they run the refresh rate through the cycle. As the 8000's moved to the 8200 the components changed. You must have a good sales person to work with in cycle changes to ensure you have the newest models the earliest you can in order to be ready for one the change and two the image you throw on them.
Example in the Z series would be right now they are teh Z400, Z600, and Z800.... The Z800 being pretty close the proliant server line in performance.
Starting in June the new cycle rate will go to the Z420, Z620, ect ect..
As the cycles change the internal components do as well. As a rule for the most part. I understand due to imaging when internal components change it sucks. And to the MFR's defense if say Intel, or Western Digital/Seagate are to change something during production the MFR is pretty much left out to dry.
And example of this would be the Lenovo Thinkpads of recent as Intel changed the Chip Set on them during mid cycle. Not very MFR friendly.
Either way the Business line of most MFR's is a much better bet for reliability than the Home/End user line. Also add to that the MFR warranty and support should also coincide as better. Especially if when purchasing HP you add the Carepack.
I'm not a huge warranty person BUT that said if I'm spending over 1k (which is my threshold) I consider what the extra warranty offers me. As I said most HP business models come with 3 year on site so in that sense it's not worth it to add the care pack, unless it's mission critical then the 4 hour response time comes in handy.