I have a Go Baby and love it. I've done a lot of triangles and circles. I wish I could get the Rob Peter, Pay Paul die, but it's too big for the Baby. If you like precuts, there's a die that will cut 2.25" strips. That one seems to be very popular.
The best price on dies anywhere is a Yahoo group called pinsandneedles1. The group owner sells them at a price that cannot be beat, including shipping.