Woody's got an RX and he's got a steel bar from Ironman I believe so it might be worth checking out Ironman (if you haven't already) and see if they do an alloy bar. Otherwise TJM and ARB should give you some answers.
I'm getting a steel winch bar with stainless loops put on tomorrow ... VERY reasonably priced ($1280 fitted including integrated driving lights plus $130 for wiring which needs to be done because my ST doesn't have factory fog light wiring loom plus frontal plus additional $160 for front bash plates supplied & installed to further enclose around bar / radiator etc.
Total $1580 fitted with the extras ... they seem to be a reputable company - seem to do a lot of work for local dealerships, have a couple of outlets and I think they manufacture the bars locally (all to Aus Standards / Compliance).
Give them a call to see if they have a bar to suit.