My brother bought Series 6 back in 2000, and I used to watch each video every night
It is probably my favourite show f all time, I remember one day finding E4 and seeing that they were showing the new series(7) and I was very excited.
I think series 1 and 2 are probably the best, along with 5. The early episodes are better in my opinion, shouldn't really have got Chandler and Monica together.