Depends hugely on your style of course, so many options.

I liked felar maran thug...with cheapshot, scrolls, weapontrip. Get at least third attack in the thug path, then take whatever other utility options you prefer. Once maran you've got your fire vuln covered. It's a deadly build with some sneaky tricky options if you can roll with being a goodie.

Whatever you do, do not even think about playing a binder.