I will defer to Johnny (audioconnection), as he knows these speakers inside out. True, the 3a sigs will need more power than the 2's, but if powered properly, will give you more bass than the 2's.
I had the 3a sigs with a pair of 2w subs, and it was very good. I now have the Treo's with 2wq subs and have no intention of changing anything for quite a while.
@bstat, Your upgrade path seems sound (pun intended). Adding the subs should flesh out the music, and like I said, they can be used with the Treo's to great effect should you wish to upgrade beyond the 2ce sigs.
@mr_m ,
TMR pics always look washed out, to me. I would contact them to see if they really are bleached out.
B