If I didn't have a bunch of the stuff already, id go WACP I think. Nikon FX body...
WACP + 28-70 + zoom gear + ext ring 35 = $4600
230mm dome + 16-35 + Ext Ring + Zoom gear = 3600ish, 3900 or so with 250mm dome.
edited to add ext ring 35 for wacp..eek!