How long do you need to wait after spraying before tilling? My lease is a couple hours away and I want to get as much done in as few trips as possible. What would be your strategy?
I'm not sure of your plans or expertise, but are you sure you really need to till?
What are you planting, and what is there now? I've had really good success mowing, spraying, and broadcasting several different plots including wheat, rye, clovers, brassicas, etc.
There are as many negatives to tilling as positives.