S&W 686. A .357 that is very enjoyable to shoot .38spl
As for a semi-auto, I find the Sigma to be very accurate but the trigger is very heavy and, as a beginner, you may find it difficult to master. But it is inexpensive compared to your other choices. Both the Sigma and the Glock are polymer, why do you favor the Sigma over the Glock?
S&W 686. A .357 that is very enjoyable to shoot .38spl
Ah, nothing like my 6" 686 7 shot with a Reflex Sight... Oh, Joy! That is until I need to press some out, then its the trusty 'ole Glock 17 with a high cap mag...
...AOV gets that glazed look in his eyes again and hits the net for a little gun porn surfing...