Well since the untethered jb should be out any day now, I would wait and see first.
So is there an untethered JB available for the iPad 4.2.1 yet?
Thanks
Not yet..., unless you are on a Mac, have access to 4.2b3 SHSH blobs for your iPad, and also have access to the 4.2b3 firmware. Then you can use a beta version by the dev-team.