I think retail machines are geared for the average consumer for home use. These can nowhere meet the demand of a graphic heavy user and designer. Sure they will work but its like using a screwdriver to pry the cork from the wine you bougt a page or 2 ago.
Would you but a plotter from walmart? Why get your main tool in your shop from there. Most shelf units are put together with the cheapest componets and loaded with bloatware so you have to give them all this information just to start up.
Someone mentioned a few pages ago comparing booting a new mac vs a new
windows pc. He said he had to enter all kinds of info on the win box but just his user name on the mac. Here is a good example of someone who had a bad experience with a cheap off the shelf bloatware kmart box trying to do something it was not designed to do. And then comparing it to a semi purpose built mac. In that cheap 600 dollar price range all your paying for is the advertising that you are submitting your self to.
Have a pro put one together, get a spec rig from a manufacturer or build your own and you will see all you need to do in a
windows based machine is enter a user name too.
Keep the acers and compaq's for the kids. Apple has done 1 thing very good, not subject themselves to third party vendors and any builder under the sun from using their os and kept it clean.