Need somone to verify my calculations please. I figure the highest spell DC you can get is a 35. Yes, I realize this is situational in the sense it's not all schools:

10+spell level+Casting Stat+spell focus Item+Spell focus feats

base- 10
36 chr/int- 13
spell level- 8
spell focus- 1
greater spell focus- 1
item (dreamspitter)- 2

total= 35