I feel Atton and Brianna (if u're using a male char) is the best, i only ever converted bao-dur once, and due to the force restrictions it was not as easy to use.
also, converting Mira into a jedi will make the hanharr battle at the end easier. same goes for brianna wif her sisters, and atton wif sion (with tslrcm patch that is). just my 2 cents worth =)