Hate to say it delta, but at that price you're better off keeping your gear and waiting till your situation becomes better.
Getting your body/lenses/flash new at b&h is only $1900 (well...the flash is used cause the sb-600 is discontinued). Realistically, if everything is in mint condition you are looking at getting about $1600 for body/lenses/flash. If you have a high end tripod/ballhead that will get you some more, but it depends on which model you have. The filters/batteries usually won't get you anything extra (unless they are high end hoya's or something), but they can sweeten the deal to help get a buyer who is on the fence to commit to buying.
I've bought and sold a fair amount of camera gear (~20k worth), granted it's all been canon gear...but I'm sure Nikon sees the same resale values.