The green used for supporters now is the exact same shade of green used for the standard users on the Conway style. Just thought I'd point that out... because now everyone is the same color for me. lol
Honestly, I don't really think its a big deal because supporter nicks are italicized on all parts of the forum and they have badges showing the tier they are in by their posts and on their profiles, so there are multiple ways that you can tell if a user is a supporter or not. Just my 2 cents.
I remember back when Supporters had blue names and I was using the Nimbasa's Shining Beauty skin and I had trouble telling Supporters and regular members apart cos they were almost the same color.
If you're having such difficulty, try changing skins like what everyone else said. I'm using Chromatic cos it makes regular members have plain grey names, so I can differentiate them from Supporters better. That was probably why I ditched Nimbasa's Shining Beauty back then.