I think combined fusion/fission options are the clear choice for the future. (Also, yes, that is what the H-bomb does, and no, that is not what the sun does.)

Here's how combined fusion/fission plants would theoretically work:

A fusion reaction is used to create a large quantity of high-energy neutrons. These high-energy neutrons are then used to cause fission in an otherwise subcritical fission assembly with extremely low enrichment fuel. 'Natural' uranium (U-238) is fissionable, which means that it can undergo fission in the presence of /high energy/ neutrons.