[ HP Envy 15z-j000 ]CPU Upgrade or Dual GPU Upgrade?

[XxBingxX]

So recently I've gotten an opertunity to grab myself a new gaming rig....yes..it's a laptop..I know laptops aren't that good for gaming...etc..etc...but I prefer a laptop rite now,gonna build "dream comp" later in life...So anyways...I'm custom ordering my laptop from HP and I'm wondering which upgrades I should get.

AMD A10 5750 CPU Upgrade
or
ATi Radeon 8750M + AMD Radeon 8000 Series Dual GPU Upgrade

trying to keep the laptop budget below $650...

[uhZylon]

Not sure on the the CPU but the GPU upgrade seems fine.

[XxBingxX]

The Stock or Standard Build from HP is an AMD A8 5550 CPU with a Radeon 8550G GPU,
the AMD A10 5750 CPU comes with a Radeon 8650G GPU and is "15% faster than the A8" in terms of raw CPU power...

** edit **

I wanna grab the Dual GPU...but idk if i can just used the discreet card alone without crossfireX