I worked my way through college as an insulator. So I am a little Biased. But it is well worth the money to invest in insulating up to the local requirements. This is especially true if you plan on keeping your house for more than three years. Some of the big box stores rent out the equipment to blow cellulose in yourself. Where I live they will lend it to you for free if you buy a certain number of bags of insulation.
Batts have a reputation for leaks, because there is almost always spaces between the batt and the joist. SO even if you have R19 batts, there are probably places where you have no insulation or only an R10 (or less). Blowing something like cellulose over top of the batts will improve the insulation system, more than the numbers might reflect.
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