sky italia shows more english games, dish size depends where you are.
Consider that recently Sky It has started to remove the comments in english during the english matches.
you will need an offical viewing card or cs to view it and probs a 90cm dish should be ok, a 1 meter will be fine thats what i have.
a 1 meter will be fine have a look on ebay, and your Vu+Duo will be fine.
if the 80cm is big enough yes, but i would go for a motorised setup mate cost a bit more but much better.
Ive got a 64cm dish, with 2 LNBs. One pointing at 13e (Sky Italia) and one pointing at 19.2e (Sky De) Im about 30 miles north of london and get perfect reception on both sats on a 64cm dish. I have known people to get a perfect 13e reception on a zone 1 sky minidish in the herts/essex/london area