Whatever they are, I'm happy to see you getting that many computers to play with.
Assuming they are G4s, you should know that there are 4 major variations, all with their relative merits and downfalls. The collector will want all of them
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1. The Yikes! uses a ZIF-socketed G4 and PCI graphics card. It's more-or-less a Yosemite(B&W G3) upgraded to a G4 processor.
2. Sawtooth(AKA AGP Graphics). These use an AGP graphics card, have 4 RAM slots for a max of 2gb, and have the CPU mounted on a daughter card like later G4 Macs. Another interesting thing about these is that they have a 3rd USB port mounted directly on the logic board.
3. Gigabit ethernet. As the name would suggest, these have on-board gigabit ethernet. The other major internal change is that-with the correct graphics card-these can power an ADC display.
4. Digital Audio. Internally, these are more like a Quicksilver. They have 3 RAM sockets for a maximum of 1.5gb, although a 133mhz system bus, and 4 PCI slots(plus AGP). They also contain an onboard amplifier to output to the Apple Pro Speakers(hence the Digital Audio name).
The Yikes! and Sawtooth have a green LED behind the power button. The GigE and DA have a white LED.
Once you get them, let us know which version(s) you have!