The Bridgestones at £96 for a pair would be fine - £100 to keep your car safe vs the potential cost (financially if you crash your car but also potential cost to people's life).
Having Michelin's at the rear already there is no need to replace these (you don't have to have 4 matching tyres, as long as they match on each axle it's fine, and each axle has similar performance)
It doesn't matter whether it's a 1.0 car or a 6.0 litre car - all car's can achieve speeds where bad things can happen (even if that is at 30mph in a built up area and a child steps out etc)