I've been debating between the two as well, after reading this thread...the SLR sounds fantastic but I can't find any near me or on GunsAmerica.com .
My Saiga conversion plans will probably run the same, or a bit lower; I'm going to get the Intrafuse buttstock/grip and handguard, and a 30rd SureFire mag, and possibly change out the sights. Saiga+Intrafuse+Mag = about $630, add sights change and it's $670-715.
In the end, I guess it boils down to: Is there a huge quality difference between a converted Saiga and an SLR?