Dell. Cheap junk. They lie to their biggest customers - say they're getting discounts and then charge them EXTRA. Every single piece of equipment in a Dell PC, save the Intel CPU, is a lowest bidder item. And the CPU is even lowest bidder, since Dell gets somthing like a buy-one-get-nine-free deal with Intel.
Their monitors, save a VERY select few rebadges aren't worth the plastic they're built out of. Their other products aren't even worth considering.
I also hate Gateway, they build crap that consistantly malfunctions. But at least it ATTEMPTS to work.
(For reference, I administrate 60 Gateway systems of P2-P3 age, 1 Gateway system of AthlonXP age, and 90+ Dells of P2-present age. I'll take the Gateway P2's over the Dell GX280's (P4, PCIE, SATA)