Save DCs are very dangerous when they get high enough. It's not like attack bonuses where having a high value means you deal damage reliably (or do more damage with Power Attack). High save DCs mean that battles end immediately with no recourse through SoDs and the like. If you just want more reliable and more effective powers, ML boosts mike work better. With the way augmenting works for most powers, an ML boost will even have a bit of a DC boost as well if you were worried about powers not sticking. But you shouldn't be, save DCs are usually high enough against foes not buffed to the gills, and against them buffs, saveless debuffs, and dispels should be the tools of choice, not brute forcing through high saves.
Back in 3.0, there were a large number of effects that added significantly to save DCs. In the transition to 3.5, most or all of them were either nerfed (Spell Focus went from +2 to +1, for instance) or turned into CL bonuses (Archmage, Red Wizard). That's one of the changes I strongly agree with.
Edit:
Resonant Tag: Blindsense against creatures with resonance.
Rapid Refocus: You gain all of the psionic focuses you can have when you use Concentration to gain psionic focus, instead of just one.