best bookshelf speakers for < $2000?


I have Studio-20 V5s on stands right now for my living room 2.0 music system and, while I like the sound, I need more bass extension.
I don't want to add a sub due to room clutter concerns.   So, I am looking fro an upgrade from my Studio20s.
I have been looking into towers but now am thinking, why not stay with sand-mounted speaker since I have the stands already.   This is for 2ch music only.  My amp is Emotiva UPA-2 SS amp.

Would I do better to go towers or go higher-end bookshelf speakers?


The towers I've been looking at have been 
Salk SongBirds/Towers
Ascend Sierra Tower
Silverline Prelude Plus

Thx.
albireo13
I agree with the idea of waiting until you move prior to purchasing speakers. Might even wait on the amp purchase as the amp/speaker interaction is important. The room/speaker interaction is acoustic. The amp/speaker one is electrical and acoustic. 
Mesch, that was funny as I was reading it.  I totally agree with you, lol.  Think about it, how many seasoned guys would say the same thing?  Most?  I think over 90%..Doesn't make it correct, but it makes sense.

Yea, the room is so much a component of a system. The room can dictate speakers which in turn dictate an amp. Not to forget ones personal tastes in the synergys.