I would call CDNN and see if they have any used Sig P6's left. That was about the best deal on the market for a while. They also might have some .357 Sig HK USPc's for about $499 brand new!
I would be hesitant to recommend a handgun chambered in .357sig to someone as (what sounds to be) a first handgun. A bit spendy and snappy on the recoil.