Vibration at slow speed

I have replaced the near side front wheel bearing while replacing the break shield on my Freelander, the CV Joint was replaced relatively recently, only to develope a vibration between 20 and 30 mph after which all is clear. Wheels have been balanced together with swapping back wheels for front to no avail.
For want of any better advice I am about to again replace the bearing and the CV Joint incase I have somehow damaged them.
Any better advice?

Just came across this post. I've got a very similar vibration happening after replacing my CV joints with after-market shafts (see my recent post). I'm planning to pull them back out next week and stick in second-hand OE shafts, but did you ever find out what your vibrations were?