Your right. I also made the comparisson with the Dell M1530. Basically i think it proves the point that the mac is not overpriced, when a similary spec'ed Dell cost *around* the same price.
Macbook Pros are very competitive, The imacs are very competitive. The Mac Pro line on the other hand could use a mid-tower, but thats more a lacking product, not an overpriced one. (try putting together an 8-core Dell and you will get around the same price as the mac pro's)