Plan and billing period first. When a product has several plans or billing periods, a dropdown sits at the top of checkout, with what the plan includes right under it.
Coupon field. Clients can enter your coupon codes.
Clear recurring charges. Above the payment buttons, recurring products show a line like "$45.00 today and $45.00 every month until canceled", plus agreement to your Terms. The client's agreement is saved on the order.
Instant activation. Card and PayPal orders activate right away; manual-payment orders wait for your approval.