I'm pretty sure your claim about the 45,000 IOPs being the most of any SATA SSDs is no longer true.
The (consumer grade) Intel 520 SSDs claim 80,000 random write IOPs, and I think I remember seeing the cheaper SATA SSDs on the Dell R720s doing 100K+ (obviously the SAS SSDs do more as do FusionIOs and PCI based express flash)
But to bring it back to Ubuntu - do you use the Ubuntu OpenStack distribution or what?