Ekstasis, yeah, those are some killer ones. I love that F# cluster chord. I've used that in a few songs myself.

That last one, the Dbadd9(whatever), works well for transitions. Try going between it and an Aadd9 chord. Like this -

E:0 E:0
B:0 B:0
G:8 G:6
D:6 D:7
A:4 A:7
E:x E:5