Here's my version of a II-V-I in G. I use this alot in me playing. Often, I change my voicing as well. Sometimes, I subsitute ALT in the II chord or #9 in the II and V chords. However, you must end the I chord with 7th chord. I can send you some examples (if you'd like to see them).
Here we go..
LH/RH
AG/CEB
DGb/CEA
G/GbABD
God Bless
-Al