I know where a full 05 swap with R180 axles, hubs, and everything plus BBS rims for $4800. However my buddy is getting it....just letting you know it's possible.
after a lot of researching about rear diffs, be aware that an R180 is not automatically stronger than an R160. the R180s come in two flavors, one with 2 spiders and another with 4 spiders. I am not sure what subaru is using (2 versus 4), but almost all LSD R160s (from the factory) use 3 spiders and will be inherently stronger than a 2 spider R180. factor that in when you are doing the swap. I'd rather have a 3 spider R160 and keep my rear spindles/axles than swap over to a weaker R180 and have to drop a lot more $$
^^^I totally agree which is why the 06/07 6 speed swap for 02-05 WRX owners is so simple. If/when I bust my rear end I'll get a Kaaz rear LSD that will be twice as strong.