It's a buyer's market for used bikes; therefore, I believe you can find, with a little effort, a great bike for $1k.
If you're limited to a single bike, I would recommend a great road bike over a dedicated tri bike. I know some will disagree but a good road bike will let you train in all kinds of conditions and will be fun to ride.
If you're limited to a single bike, I would recommend a great road bike over a dedicated tri bike. I know some will disagree but a good road bike will let you train in all kinds of conditions and will be fun to ride.