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XBMC is without a doubt the most polished media player available for any platform.
You said it... and it just works, you get everything from Itunes trailers, free online gaming, radio stations, and it plays every format a 733 meg p4 can handle.
UAEX Amiga Emu is great. I have 2 usb converters that allow Keyboard and mouse usage. System 3 in installed on mine.
I have all my games on the hard drive as well. Just a great deal all around. Since 2003 this became my main game machine and still is, gets the most use.
I Play the following systems:
Amiga, Sega Genesis/32x, Master system, Nintendo 8 bit, 16 bit, 64, Turbograhix16, Gameboy advance, MAme, Capcom Arcade, Playstation 1, Atari 2600, & ColoecoVision, All of this on a 320 GB drive.