Currently I own:

Reciever-yamaha 1500 7.1
Fronts- jbl s-412
Center- jbl s-center
Sides- jbl s-312
Rears axiom Q4's
2 200w homemade subs.

Would like to upgade to:
Reciever- yamaha 1500 7.0
Amp- Gemstone Blue Diamond 7.1 200W@8 OHMS 400W@4 OHMS
Fronts- Axiom- M80
Center- Axiom VP-150
Rears- 4- Axiom Q8's
Subs- Dual SVS 16-46 CS-Plus 1000W total.

My room is 15x15x20 vaulted cieling with an opening in the rear to a room of the same size.I will be moving in to a new house with a dedicted theather room of undetermined
size within the year.

Would this be a worthy upgrade or would thier be to little
of a difference to justify the money spent?

All input is appreciated.

Thank you, steve