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The usual dosage range of Clonazepam (Klonopin) is from .5 to 2 mg per day and keeping that in mind, you are currently on a very low dose and theoretically speaking, I agree with your doctor here. You can try to stop it and most likely you will not experience any serious discontinuation / withdrawal symptoms as such.
Some patients who are very sensitive to withdrawal symptoms and may find it very difficult to taper down even a very low dose of Clonazepam. So as an alternative, you can try start taking your current Klonopin dose every alternate days for 5-7 days followed by start taking it with a gap of three day for another 5-7 days followed by discontinuation. [Please discuss with your treating doctor about this option]
Now regarding your insomnia and depression, Buspar is not the ideal medicine for treating depression. It can help in anxiety but is not indicated as such for treating depression. You should also discuss with your doctor about trying a sedating antidepressant which will help in controlling depressive symptoms as well as insomnia also. Mirtazapine and Paroxetine are two such antidepressant which can be very useful in your case. Both of them are a very good antidepressant and can cause significant sedation also.
Once your doctor will switch you over to a sedating antidepressant, there will be no need to take Ambien.
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