Is it dubious the V5C is not registered to the seller?

I viewed a car today and it was advertised by a private 'dealer'. However, the V5C details were not that of the dealer and so I queried it. He waffled on about filling in the documents etc etc. I explained...

What's the best used car for under a £1000?

I'm looking for a used car and have £1000 to spend. I want something with a bit of power, motorways at weekends and city driving during week, any suggestions?