Upgrade JBL 7.1 Setup to Energy RC-70 Setup? (1 Viewer)

[ffactoryxx]

So basically I have the following setup in my basement right now.
Its a about a 20x12' room with my TV one of the 12' walls with my speakers on either side. The floor is Tile on a slab with a big area rug over it. Its a nice Rectangular area'
Currently have a setup I built back in 2002
Fronts- JBL S-310
Center - JBL S-Center
Surround - JBL N26's
7.1 Surrounds - JBL 24's
Sub - Sony SW40
Receiver - Onkyo RC360
TV - Mitsubishi 65" DLP
I have been toying with upgrading the sounds system in my Home/Theater - Game Room and moving the current to my Living room.
I guess the real question is will I hear significant differences with the following over what i currently have.
Looked at
Fronts - Energy RC-70
Center - Energy LCR
Surrounds - RC - 10
(potential RC-10's for 7.1 if I decide to go that way)
Right there I would be looking at around $1100 to overhall just the speakers. The sub can be the last to upgrade as I am in a townhouse and keep my base moderately mid level anyway.
So few questions....
1. Would that upgrade be worth it and how significant of a difference will I hear?
2. Would my receiver be powerful enough to handle these speakers?
3. Would there be cheaper options that would still be a huge upgrade but cheaper than the energy route. i have seen Polks, Energy V6.2, etc.
4. Is my space to small for Badboys like Energy, etc.
Thanks in advance. Just trying to flesh out my thoughts here.

 

[schan1269]

1. The RC70 achieve a slightly better low end, but the lowest crossover in Onkyo is 40hz, so it doesn't matter.
2. The RC70 are 1db more efficient, so they'll take 1/3rd less power than the JBL you have now.
3. Where do we begin???
4. You could fit Klipschorn if you had $4000 per speaker.