Don't forget the enchantress can give you a 15% armor boost as well. As Shinna stated, a main hand replacement shouldn't break your bank at all, The same weapon with 100 dex instead of int would provide a decent gain. I would also make it a point to get rid of the first ring; fire resist isn't your main. You might end up losing 1% or so on your crit rate, but a 3% 100+ dex ring shouldn't be too expensive at all, if you're concerned about losing that life on hit, switch to life steal on your main in addition to a crit, socket, and dex. Lastly, those gems in the pants and amulet are a cheap upgrade.
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