microsoft - i'm a windows user and i like it (would like to try apple, but too $$)
intel - i like their processors but will go with whatever is the best bang for the buck in the intel/amd war at the time i'm looking to purchase.
nvidia - familiar with their graphics and have heard lots of good things about them so will stick with them for now.
samsung - they're doing a good job right now in quality on their monitors and HDTV's and they offer them for decent prices.
itunes - my music
sony - game consoles (have ps2, want ps3 eventually)
kingston - ram (or maybe crucial too)