With respect, neither will sending out a load of cards.
Dan,
You've got to thnk of your marketing like the spokes in a wheel. All the spokes lead to the central hub - sales. If you've only got a couple of spokes you're going to have a wobbly wheel and little sales. What you need to do is add spokes to your wheel. Yellow Pages Ads, improve your website, get on Google Maps, Leaflets, telesales, door knocking, local newspaper, parish magazine. Yell.com, so that you end up getting sales from a number of sources and not just one or two.
Simon