I have a converted K10D from Spencer's Camera (830nm conversion). It's served me well. Just note that some of the more recent reviews for Spencer's are bad. Looks like I was one of the lucky ones. Here are a few from that camera.
Byodo-In Temple, Valley of the Temples, Oahu, Hawaii
Tunnel View, Yosemite National Park
Yaki Point, Grand Canyon National Park
Hakimo Road Ruins, Waianae, Oahu, Hawaii
I'm thinking about getting another K10D and going "full spectrum" rather than 830nm IR only.
There are a bunch of other ones here.