Hmmmm...
I'm a little late, but I'll post my two-cents worth on Dell.
I've had four Dells. I have no gripes against the machines for basic use and when someone recommends an online retailer, I will usually refer them to Dell. However, for more extensive expansion/specialized computing, you just can't beat a custom-built computer.
On the case issue, I fall into the hate-Dell cases category. I bought a Dimension 4100 several years ago, and upgrades in that case weren't much fun. When the motherboard fried in it earlier this year, I wanted to gut the machine and rebuild it. I succeeded, but when I went to put the side cover on, alas, the power supply that I replaced interfered with the mechanism that screws the cover in. Not the type to easily give up, I took the Dremel to the case (luckily it's cheap plastic) and made a custom fit.
But IMO you shouldn't have to do this to a case when you decide to upgrade. More propietary case designs mean that you have a stricter range of products that you can retrofit into the case--which simply isn't fair to the consumer. My Antec case, OTOH, was easy to work with right from the start: Easy to install drive bays, quick open case, multiple fan mount points, and plenty of room for everything else. It's very straightforward, not a lot of weird slots or attachment gizmos. That is what I look for in a case. Oh yeah, and it's built like a Sherman tank!
I realize this post is sort of post-battle, but I at least wanted my voice heard!