No idea how to root the DX, but the DInc has plenty of threads. It's sounds like you got it rooted. If so, just stick the ROM zip of your choosing on the SD card and use ROM Manager 2.5.2 (Don't let it update to 3.0.0.7. It will not work on the DInc.) and install. I've got 8 zips on my SD card right now. I've been using the Redemption ROM (see my siggy for a link) for a week now and I just switched over to the
Incredibly Re-Engineered ROM last night. So far I love it. One thing to keep in mind, the DInc has an add-on called Sense. If you don't install a ROM that will allow Sense, your friend might not be happy. I know that if I can't get Sense on a ROM, I won't use that ROM.