Finding a PB 3x faster than TiBook


I have a dying TiBook 400 Mhz with about 700 MB RAM. I would like to buy used/refurb/new PB that is approximately 3x faster.

1. Should I just multiply 400 x 3 and buy something 1.2 GHz or faster?

2. Is there a site that displays realworld benchmarks for all Macs since 1999?

Thanks for any advice or recommendations.