Whilst your budget is always a consideration you must realise that the cheapest quote on the day is quite possibly the worst choice. Many of the cheapest driveways are little more than a large amount of sand rolled across the ground with paving simply blocks laid on top.
In time this leads to driveway sinkage and eventually the blocks themselves will start to break away from the pattern and just sit loosely on top of the ground.
All this simply means that you have to pay someone else to replace the driveway at some point in the future.
A good respectable company such as EDC will do the job properly from the start with a decent excavation, use solid aggregates and textile layers to minimise the chances of any weeds or other vegetation coming up through the drive the following year.
As a sister company to the Garage Conversion Company (GCC) EDC has a reputation to uphold and any complaints you may have (no matter how small) are dealt with very seriously.