I've got lots of love for many of my classic Macs (along with some others, like my TRS-80 Model 100, and my DEC Rainbow), so it's hard to really pick one to stand above the rest. Some of my systems are much-loved - my SE/30 and Color Classic are used often (and are obviously popular with other collectors), my suped-up G4 Cube and TAM are very cool from an aesthetic perspective, and some of my portables (Mac Portable, eMate, etc.) are hard to beat. Honestly, I have to admit that my "favorite" is often whichever system has grabbed my attention, so with that in mind, my current top-dog has to be my recently-acquired Mac IIfx.
As you guys already know, the IIfx was an interesting (and some would say failed) experiment by Apple - to create an absolutely bleeding-edge system, using many custom parts, and to claim the crown of fastest desktop system on the market. In some ways, it was the Mac Pro of its day. Of course, the IIfx turned out to be an evolutionary dead end, and perhaps because of this, it's sometimes overlooked as a collectors system.
My IIfx has an interesting history - it was used for nearly 10 years as a CAD workstation, doing the design work for the soon-to-be-completed New Mexico Spaceport! Anyway, I've recently been spending a lot of time (and money!) on my IIfx. Since becoming part of my collection, I've added a 14" LCD monitor, SCSI-to-IDE adapter (along with a fast 40gig drive in multiple partitions), an external SCSI CD burner, a 33mHz Radius Rocket card, a SuperMac VideoSpigot board, and an FWB JackHammer SCSI booster card. While I doubt it would compete with a later system like a Quadra 840av, it's still fun to see what would have been a $15-or-$20,000 system in its day sitting on my desk.
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Huxley