Yes, a 200 watt power supply would be able to handle it. The cards have a maximum rating based on what the NuBus slots can provide.
The best reasons for going with a 900 or 950 would be to have five slots and up to 256 megs, plus more space for internal drives. The Quadra 800 can have up to 520 megs, but only if you install a modified ROM SIMM (and only if the motherboard has a ROM SIMM slot or you install one).
A Quadra 900 runs at 25 MHz, so if you can get a Sonnet QuadDoubler or a NewerTech Quadra Overdrive, you could have a 50 MHz m68040.
You wouldn't happen to be offering a PowerMac G5 for a Quadra, would you?
The best reasons for going with a 900 or 950 would be to have five slots and up to 256 megs, plus more space for internal drives. The Quadra 800 can have up to 520 megs, but only if you install a modified ROM SIMM (and only if the motherboard has a ROM SIMM slot or you install one).
A Quadra 900 runs at 25 MHz, so if you can get a Sonnet QuadDoubler or a NewerTech Quadra Overdrive, you could have a 50 MHz m68040.
You wouldn't happen to be offering a PowerMac G5 for a Quadra, would you?