Id go for a ranger/cleric multiclass , this gives you all the nice cleric immunity spells , like death ward and chaotic commands. Being ranger you also get access to the druid line of cleric spells , which can be extremly good against large groups of enemies (insect plague/creepingdoom). The ranger cleric also gets stealth (if you use the right armor). Since rangers use 10 sided dice for hps and clerics use an 8 sided , you will almost have as many hps as a pure fighter. Youll also have early access to the cleric and fighter high lvl abilites . The biggest bonus however is ironskins, going solo means getting to a high lvl fast, so many of your encounters will be against the maximun enemies you can face. When your maxed out youll have 9 5th lvl spells , that means 6-8 ironskins (need chaotic commands too
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, ironskins casting time is 1 , consider that youll be useing the amulet of power, and they are "insta-cast" which makes them invaluable for large melee battles. Youll have to stick to blunt weapons but that is not a problem at all, you can just summon some skell warriors if you are fighting stone golems. All this with all the melee strength of a regular fighter, and it is hard for me to imagine a more powerful character. I personally took one all the way through SoA and ToB , i found it a good challenge .
-Lykwid