That's a tough call. Fitzpatrick, because of his name recognition, probably has the best chance of winning the primary and then kicking Mini-Murtha out the door. But his voting record is not the best you could hope for. He's a Catholic, and presumably pro-life, but there's no mention of that issue on his website (at least that I've found). That also applies to Jones. Both Carlineo and Hoffman claim to be pro-life, but they have stated a willingness to let Roe v. Wade stand. That's the same attitude that so many FReepers found objectionable with Scott Brown.
All four seem to be fiscally conservative. In my opinion, that's the most pressing issue right now, as the RATS continue to run wild with money yet to be printed.
If the primary was today, I would vote for Hoffman.
From Ira Hoffman’s web site:
My 8 Guiding Principles for the 8th District and the Nation
1. Slash government spending and eliminate the deficit.
2. Reinvigorate private enterprise.
3. Enact health care legislation that can reduce health care costs.
4. Make America energy independent.
5. Secure America from terrorism and illegal immigration.
6. Stop cap and trade.
7. Restore ethics and accountability to government and business.
8. Reduce the role of the federal government to its powers as enumerated in the U.S. Constitution.