I know some people have fitted 300 zx calipers to their G20s, is a larger nissan badged calliper but it also has a wider aperture for the wider discs if I remeber rightly, though as your discs are custom made I doubt this will cause a problem
Get some caliper paint, stick 'em behing some quality rims and that gotta get some you attention.
Have a hunt around on the SE-r site, cos i really can't remeber who did the caliper swap. Anybody else out there know?
Al Abadilla (sorry if I spelled it incorrectly) was the one who originally did the swap, or at least the first one that I saw document the swap. Check out the se-r mailing list archives for more information on the swap, i know the info is in there. www.se-r-list.org/archives BTW, you will probably have to copy this url to your browser.