Are either of these appropriate dimmers for my setup?

Yes i know nothing about those drivers and am just trying to help based on what it says on the case. Your supplier is always the best resource for tech support

[/QUOTE] As I mentioned, that Pot was only rated 0.5W and so there must be substantially more power passing through those wires. My friend suggested at least 15W-20W.[/QUOTE]
Someone posted before that the dimmer control circuit has less than a milliAmp of current-the .5W pot should be fine.