We're off grid now in a caravan on our plot and will remain so when the house is built. Our connection was going to cost £20k and more and it just seemed more interesting to go off-grid plus I have a strong aversion to overhead cables (just don't like the look of them, they chop the sky up). We have a measly 1000W of P.V., a 600w wind turbine and a 48V, 460amp/hr battery bank. Once the garage is finished we'll fit our currently ground-mounted PV to the roof and expand the array to 3kW. Our house is small and uncomplicated and we don't (and won't) have a 200 inch TV, we currently run a brilliant A+++ rated fridge that uses 65kWh a year.
Jeremy is right about PV in winter. Last November/December was very, very dark. Some record for lack of sunlight was broken at a weather station near here and one day we only generated a ridiculous 35w/hr. We got to the point where we had to borrow a genny to avoid battery damage and considered getting either a genny or a wind turbine with the turbine winning. Once the turbine was installed we were fine, winter weather is rarely dull AND calm. Whilst turbines need a good site (ours is OK, not perfect) and don't do much in lighter winds they do provide 24 hours a day of juice when the wind is blowing and that makes up for a lot. Our turbine has been shut down for weeks now - we don't need the power and we have slight issues making the solar reg and diversion controller play well together - but it was a good buy and certainly preferable (for us) to a generator.
I'll be interested to see where battery tech goes in the next few years. Something better that our flooded cells is likely to come along and if it doesn't I'm likely to look for a better solution. It's a minor but regular pain in the arse maintaining them.