My MIDI workstation with my retro computers. I don't care how old it is that ol' Atari ST kicks my PCs ass when it comes to MIDI processing performance.
1) Two C-64 computers - The brown one on the left uses a Moog Song Producer MIDI interface. The red painted one on the right uses a Digitech Pitch-to-MIDI interface. They both share an old Apple IIc monochrome monitor. I have a switch box to select which one I want to see on screen at any particular moment. I like to use them as synths. There's a program called Synth-A-Sound 2001 which does an amazing job of stacking the oscilators to turn the C-64 into a very beefy analogue mono-synth. I also use a program called M64 to control the SID chip in real time via MIDI but I prefer the Synth-A-Sound software. I think I might check out Paul Slocum's C64 synth cart though. There's another TB-303ish piece of synth software for the C64 that I keep meaning to check out. The brown C-64 is sitting on top of a Fostex dBX Noise Reduction unit.
2) Pair of Behringer Truth B2031 powered studio monitors - Super sweet monitor speakers they were only about $750 for he pair. Sound freaking awsome. Great bang for the buck for studio monitors.
3) Tascam 788 Digital Multitrack Recorder - 24 bit digital multitrack recorder. A very nice machine. Discontinued now but you can pick them up inexpensively on Ebay. There are a few things I don't like about it but over all I've been very impressed with the machine.
4) Atari Mega2ST computer - This one replaced my old Atari 1040ST computer. I got the Mega2ST for $15 at the goodwill. Not too bad a deal really.
5) Yamaha TG-100 (under mouse pad) - A very nice Yamaha GM synth module. Nice drums on it. It's functional, but there's nothing particularily spectacular about it. Nicer GM wave set than you'd find on a computer sound card but that's about it. It's an early 90s piece of gear. It's served me pretty well over the years one of the few pieces of gear I bought brand new.
6) Tascam 788 CD-R - burner for the 788. Only 6x speed though. Bleeech! Cheap, homemade off ebay because Tascam charges an arm and a leg for their official CD-R unit and the machine won't work with 3rd party CD burners (it's just a Teac CD-R). I'll have to upgrade the burner sometime.
7) Behringer MX 1804X mixer - Nice mixer, comprable to the Mackie for less than half the freaking price. This one ends up going out on the road with me a lot so its held up really well. I'll probably buy another one soon so I don't have to disconnect and reconnect everything every time I go out on the road.