Suggested lump sum payment amount?

I had a balance of -$1888 with Tangerine bank due to a charge that caused months and months of accumulating negative balance. I have the option of either paying off the entire thing or arranging a lump sum of a lower amount. I'm just not sure what amount I should suggest. I nsf'd a $25 charge and the repeated attempts to withdraw by the preauth. resulted in repeated NSF fees. of $45. that in tandem with month. ly interest resulted in me owing almost $2000. How low should I request the lump sum payment? I'm hoping for under $1000.