Andy: You're a brilliant guy, and I love you, man. But...
I write for a living. I'm right, the dinosaurs are wrong, and normally you don't use a preposition to end a sentence with. <Note use of irony there> It leads to exactly this kind of awkward, funny sounding phrase that just needs to be repaired. You can use a preposition to end a sentence when it is absolutely necessary. As Churchill once observed: "That is the kind of pedantry up with which I shall not put."