If you like the job compressor did, mission accomplished. Make sure you're viewing on a broadcast monitor and not just in FCP - in FCP you want to be looking at 100% (and preferably outputting on a broadcast monitor.)
You really can't judge compressor vs. RedGiant (or anyone else) scaled up...and then scaled back down again for playback in FCP.
Oh, your budget has the ability to use hardware? Forget all this software stuff. Snell and Wilcox converter or a Teranex.