There's not much in the 5 or 6" range. Maybe an ETX125 @ $1800. Not 2" nagler friendly though I wouldn't think. Another option is the 8"LX90 @ $2900. It's bit bigger than you are after and maybe the weight setting it up may be a consideration but at least you would get to use your naglers.
Maybe you could sell your 2"ers here, buy 1.25 type 6ers and get the ETX125. I'm pretty sure your eyepieces would be very popular around here.
