Are you tight on money? I don't recommending mix/matching tires.

If you are going to commute on the bike, I'd suggest Michelin Pilot Road 2 or 3. They are about $300 a set, but you can pull 10-12k miles out of a set.

You can get a set of BT16 for $200, but they'd last you half that, at best.

If you are tight on money, the only road you can go is to do a direct replacement (getting a replacement BT16).