I have a 1.6 petrol Focus (2003), and I'm glad I don't have a diesel. Petrol is more fun, more noise, more revs, no turbo to wait for. The Focus in general is really comfortable - I do long motorway journeys quite often without any discomfort.
Great fun when roads get twisty too (independent rear suspension). I tend to get 38-40mpg with unleaded which isn't bad as i do rag it around a bit sometimes. Had it coming up to 4 years now, it's been reliable (apart from an alternator pully that broke and your general wear and tear stuff like track rod ends). Just touching 65,000 miles and still runs very smoothly.
However if you really want diesel there's plenty people around who have a TDCI Focus who wouldn't have anything different - my personal preference is petrol though, so maybe I'm biased.
Go do some test drives - I tested a Focus, Astra and Fiesta and the Focus was way out on top. I also attempted to test drive a Citroen C3 but my feet were too big for the pedals!
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