I know you feel you have lost 2 now, and this species, seems to get sick frequently. Yes there are some wc's that do not do well, I agree. But you will find that with many species of lizards.
But if you like saharans, I would not completely rule them out. Just really take the time to find a healthy one, from a reliable breeder.
I wish you well no mater what kind you decide on, eygptian or otherwise.
I just wanted to say this because I bought Crispy, my male saharan 5 years ago as a healthy looking WC , And other than having to calm him by handling, he thrived, thank goodness.
So don't be too quick to rule out a species you like just be CAREFUL in Choosing! 
An older pic of Crispy, male saharan
-----
____
----
Eve / PHEve



Don't give up 