50 litre tank will be too small in my experience

i went from a 50 litre tank to a 150 litre tank and all of a sudden there were so many more tools i could use without running out of air, saws and grinders being the main ones that are air hungry

i bought this sort of one from machine mart

http://www.machinemart.co.uk/shop/pr...air-compressor

it was about £350 when i bought it a few years ago though with free delivery

may be a bit out of your price range though