If you've got some time or an audible account - check out David R. Montgomery's books on soil. Long story short - tilling is not your friend. It will cause more problems than it will solve. Rather than invest in renting or purchasing an expensive and petroleum guzzling piece of equipment, put that $ into your inputs. The soil, while it may look rough, currently has a structure and only needs the addition of organic matter. I've put it into practice and found that feeding my soil life paid back dividends!