TheDarknes is right. There is a PAL region Wii that simply cannot be modded right now, with any chip. But if you're in the USA or other region - then you should be fine to get it modded, as long as someone can do it.
I have modded 10 of the new wii's without any hitch... Though I do have to say that with the pins removed from the IC, it is quite a job. I spend over 45 minutes on each install when it comes to those versions of the Wii.