In case anyone is in the market for a new monitor, I've just placed an order for a PCBank PB2700 27" 2560x1440 S-IPS LED backlight monitor from Ebay, for US$298.70, which works out to be about NZ$400 including shipping.
There has been a flood of these displays over the last few months from a variety of manufacturers - the bottom line is they all have the same LG LM270WQ1 IPS panel as the Apple Cinema Display (http://store.apple.com/nz/product/MC007) but at <25% of the cost. The main differences are that the panels are "A-" grade rather than Apple's "A+" (so there is some possibility of stuck/dead pixels and/or dust behind the panel, although they still comply with ISO 13406-2 class II), and the available inputs are limited to a single DVI-D dual-link connector.
There's a fair amount of discussion about these monitors at overclock.net (and a separate discussion on the panel I've ordered here).
Potentially in the too good to be true camp, but I'm quietly optimistic!