And I should have mentioned that owning an aeroplane as a group may not be that much cheaper than renting. What it does is give you more flexibilty and of course the pleasure of owning an aeroplane. This is why you should complete your PPL before buying.
This of course depends on where you base your aircraft. there may be a small unlicenced airfield or strip near you with much less charges - a massive saving which isn't available to you when training.
A Flight Engineer I know once gave me some good advice. If it flys, floats or f##ks, it's usually cheaper to rent!