Figure up your hours spent x your hourly rate. I wouldn't hit them with the same price again, I think it's rude. Sure, it's a pita that they are jerking you around a little, but they are the ones paying you. As you stated before, you made good money the first time. Price it so that you make good money this time too. I would probably charge about $1000 and 2 of my guys would have it done before lunch. Throw in sod installation quote for another $800 or so.
2005 Isuzu NPR turbo diesel 16' box
2000 Ram 2500 24 valve CTD
1996 Ram 2500 12 valve CTD
1999 F350 7.3 PSD flatbed
20' enclosed, 16' open, 14' dump
3 Walker MT 48", Toro Z500 60",
Toro proline 48", Dixon ZTR 42"
Stihl small equipment
SC licensed pesticide applicator