Yeah i definitely wouldnt be too concerned about a split bridge clean tone because the clean tone you will get from the middle and neck positions will be good anyway, especially with the jazz. And if you get something like a C5 to go with it in the bridge the clean tones will be great with no splitting required.
I also live in Australia and one thing ive found is that dimarzios come a little cheaper than duncans around here...depending on where you get them from of course, but id look into the new dimarzio Virtual PAF hot bridge pickup...and if you want more of a change even a dimarzio Virtual PAF neck to go with it because ive heard absolute rave reviews about these pickups and the neck one especially is meant to be one of the best neck humbuckers around at the moment. My tech described it as being a really open but still fat sounding pickup with a hint of strattyness to it even...if thats possible! But he couldnt get over how good it sounded both clean and dirty. Read the harmony central reviews about them, they sound great!