Pay - a little on the low side, I consider 1k a player "bottom barrel" payment, the jobs they take when they're so out on their luck that they're scraping by (ammo alone can eat this, if your players like fancy guns and burst fire).
As for the whole "your techno can cover your tracks" thing, I don't think he meant the Techno could create new fake SINs, I think he meant he could erase the evidence that you had USED those fake SINs during the run.
The way I play it, if you don't use your fake SIN (going through security, broadcasting off your commlink, etc), then you haven't really risked it. Yes, SINs (real and fake) rely on biometric data, but I don't think you can really work under the theory that they can track your biometrics back to a fake SIN through the proper databases. If this were the case, any mission that compromised your biometrics would end with plastic surgery, as well as a new fake SIN.
Only if the identity is compromised, do you need to ditch the fake SIN.