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Mac Edition Necessary?

Hey Everyone...I'm fairly new to macs. I have a dual G4 w/ AGP graphics that I want to run 2 displays on. My question is this: Are all cards made by ATI or the ones in the Radeon family mac compatible? Does it necessarily have to be the "mac Edition"? Is the only difference the fact that the mac editions have the apple cinema display output on them? Can I get any ATI or radeon and drop it in? I'm running Tiger and using it for DP 4.6 by the way, if it makes a difference.
The reason I ask is that the "mac edition" cards seem to be much more expensive than their PC equivalents. I'm running 2 Sceptre 19" LCDs via DVI, so does it make a difference?

Latency & Buffer Issues--motu & G4

Hey everyone, I'm new here, and this seemed like the closest area for the subject matter, so here goes...

I have an old G4 dual 450 mhz, running tiger. I use it exclusively for DP 4.6. The audio hardware is a motu 24i based off of the 324 card. I am having really bad latency issues when tracking. I have to go to hardware driver setup and take the buffer down to like 64 just to make it tolerable. When I mix, I have to go back and reset it to 1024. My machine has 2 gigs of ram (maxed out) and I'm using 2 hard disks (one system, one audio data). My machine has tracked all 24 simultaneously without any problems, but when I try to record one track while playing back as little as 4 previous tracks, it tells me that the operation has exceeded playback capability. I'm new to DP, motu, and macs...this was just my first step towards a halfway-decent DAW setup. Is there anything else I can do to fix the problem? Cuemix is not compatible with a 324 system under OS X. Is there anything I can do without spending more money right now?