Be on the lookout for octa-core phones, I believe the Galaxy S4 has one *somewhere* out there, but not sure on graphics.
Now that I searched for GS4, I found out there is an octa-core model (clocked at 1.6ghz vs quad 1.9ghz), but no LTE support outside Asia. So unless you stick to mostly WiFi, that is out.
Edit: Upon further research, there is a Zopo ZP980+ that dons a 1.7 GHz octa-core CPU with a Mali-450 MP4 GPU@700 MHz, which seems to be better, with a decent price tag, not sure on LTE or even 4g support though.
Sent from my Carbonized Atrix HD
Motorola Atrix HD->Always changing rom (will update when I find a good one)->Anykernel (1.5->1.9GHz!)->stock battery (eb40 coming soon)
HTC Desire HD Shorted out (or shot battery)->S-OFF-> CM 10.1