/Time

Time is an illusion. Lunchtime doubly so.

Ha.

You have seen my character? His name is "Time is an Illusion," and his battle cry is "Lunchtime doubly so!"

(For those of you who don't know, that's a reference to a line in Hitchhiker's Guide to the Galaxy. The original line, "Time is an Illusion," is credited to Einstein, but it may actually be a paraphrase of "...for us physicists believe the separation between past, present, and future is only an illusion, although a convincing one.")

To the OP: I have an Ill/Time and find it to be a great combo. It is actually easier to get Perma-PA than Rad, but you have to wait until level 38 for the build to start to mature. Time adds some additional control, especially slows, when Illusion is a little bit weak on control. I decided to proc-out the slow patch, Distortion Field, so it contributes some damage. It is good at taking out tough targets because the combo of Time Crawl and Slowed Response provides extra -Resistance. I use the Ice APP with Ice Blast, Frost Breath, Ice Shield and Hibernate. I was able to softcap to S/L quite easily without sacrificing any performance. TiaI is just starting on his Incarnate journey.

Plant/Time should be good, too, but you will get less benefit from the Slow powers due to Plant's AoE Immob. Plant has plenty of AoE control and damage, but is lacking single target damage.

Sometimes people say seemingly clever things and it looks great, then someone else points out it's just a mindless rehashing of a popular joke and the illusion is shattered.

Hence I'd go Plant. /time provides so much survivability you may as well have some AoE damage from your primary to make use of that personal mitigation.