I've used a few Profile amps. They were not very impressive. Unless they've had a complete U-turn in their ratings, I wouldn't trust 450w.
I'm not saying they're bad tho. I haven't used anything from their Clarus line. They might be the next great bargain mono sub amp. However, the JBL is a reliable, proven performer that makes its 600w @2ohm and then some.
Have fun with your LE12's. You'll be very happy with them.