Gets back to personal preference, and for me, I think oranges & yellows look the best with std MG (mid grade) or HG (heavy grade) blades and FO (fire orange) definitely looks better with MG...... UE (Ultra Edge) blades make these colours look pastel and a bit washed out.......
Also, I haven't seen TRI-FO with my own eyes yet, but if it creates a fuller colour blade it should be well worth the extra $10.....
cheers

EDIT : I have FO and PO (Pyrestone Orange) and a custom "blood orange" also..... to me the blood orange is by far the brightest and most satisfying orange I've seen..... Its a custom colour using an RGBA LED wired to R+A only and Emory did this for me at the same price as a forum colour, I'm guessing he'd do one for anyone who asked..... Drahcir has seen this colour too and did comment how much he liked it..... The pics here
http://www.saberforum.com/index.php?topic=24643.msg375212#msg375212 are this orange with a MG blade...... cheers
