Yes, just like with Z68, the non only difference between the Pro and non-Pro version of the P8Z77 is a couple less SATA 6Gb/s ports. The non-Pro has an extra PCI-e 3.0x16 compared to the P8Z77-V LE, and then the LX has a few less overall features from there. With your own graphics, if you you plan to run Crossfire on PCIe 3 you'll need either the V or V Pro because the LE and LX have only one port.
The Sabertooth doesn't really provide much beyond the Z77-V, but the V is only single PCIe3 @ 16, while Sabertooth is dual, and Sabertooth seem to be geared more for overclocking.