Sorry,I should have said that the dongle is required if you can't physically attach the HDR2000t to a modem via a cable. It has no wifi capabilities without a dongle. The nowtv boxes do youtube, vimeo, ted talks and all the 5 terrestrial channels' catch-up, plus if you pay £7 per month you get most of the sky channels and catch-up too (here endeth the nowtv advert.)
To the best of my knowledge, none of the PVRs enable you to record catch-up (that's not really the point of catch-up).
Did you do as I suggested and read the 1 star reviews/ latest reviews? Does it give you the impression that the fvp4000 is likely to be improved?
All the best.