The mini in my sig is ONE of my main computers, I have it hooked up to a 19" Hannspree HF199H running at 1440x900. Hooked up to the same monitor, I also have a PC that I built. I switch between the two pretty regularly. You probably don't care about it since it's a PC but I spent about $400 total on it and it has an ASUS micro ATX Mobo, 2.5GHz Intel dual-core CPU, 4GB DDR2 RAM, nVidia GeForce 9500 GT 1GB DDR2 RAM @ 550MHz, 500GB Seagate Barracuda HDD and it's a dual boot running Windows 7 Ultimate and Ubuntu. Oh, and it's filled with bright green LEDs 🙄 lol.
I use my MacBook whenever I'm not near my desktops.