I took a quick look at the Mirage site, but it looked to me like Window only PS plugin. Maybe I missed it, but I didn't see a Mac OSX version offered.
You mentioned CS3. Do you have the suite or just PS? Indesign makes a pretty darn good image nesting tool with easy image drag and drop capability, print margin, placement, and frame control, etc. if you don't need other features of a full blown RIP like more advanced ink limiting and linearization. With a little effort you could probably work out a scalable template for your gallery wrap needs with it as well. For a 44 inch printer, ID as a standalone purchase costs no more than Imagenest, and as far as I can tell, give's Imagenest pretty fair competition for versatility and speed. Another inexpensive option might be to use Qimage running under VMfusion or Parallels on the Mac, but I've never tried it. Lastly, the Canon imageprograf series of printers throw in a sweet little known utility called "Free Layout". Not quite as robust as Imagenest, but not bad for many Canon iPF owners because it has no additional cost.
Mirage works well on Mac OSX. I´m using Beta 1.5 on Mac OSX 10.4.11 with PS CS4 and with Epson 4880 / 9800. It is quite easy to use and you can test it for 14 days for free. So try it and see if it fits in to your workflow or not.
Supported Applications
Windows:
Adobe Photoshop 7, CS, CS2, CS3, CS4 & CS5 in 32 & 64bit
Adobe Photoshop Elements 6, 7 & 8
Adobe InDesign CS3, CS4 & CS5
Macintosh:
Adobe Photoshop CS2, CS3, CS4 & CS5 (32bit only!)
Adobe Photoshop Elements 6 & 8
Adobe InDesign CS3, CS4 & CS5
System Requirements
Mac OS X 10.4 or later, Windows XP SP2 or later, Windows Vista 32 or Vista 64, Windows 7 32 & 64 bit
Professional Printing New Defined
Now you can enjoy printing without complex printer drivers. Mirage is a professional print plug-in for Adobe® Photoshop and InDesign and is available for the latest Epson Stylus Pro printers.
• Fast and simple to use
• Saves time and money
• Supports all colour modes
• Absolutely no length limitation
• Supports USB and TCP/IP connection
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Compatible with Apple OSX, Windows XP
Vista 32 and 64 bit, Windows 7 32 and 64 bit
The Mirage software, the Mirage Quick Start Guide, the Mirage User Guides and the Mirage Datasheets are legal property of din.a.x Digitale Bildbearbeitung, Neuss, Germany.