I would go with a Glock Model 23. Excellent gun and can be had for about 525. But I am biased. (Major glock fan, here
)
The sigma is a poor copy of a glock IMO, and if you plan to shoot it much, you'd likely be disappointed with the consistency of performance, or should I say lack thereof. Trust me. I had one.
The Glock platform is king for a reason, pretty much.
If you are on a budget, weapons such as the Sig Sauers and H&Ks are gonna be too pricey (800+)
If you are not a glock man, try the taurus millenium or 24/7 series pistols, depending on the size you are looking for. The Smith and Wesson M&P .40 is a nice pistol as well.
Happy hunting and good luck.
1986 Honda ATC 200 S
Some quads and a S x S
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Supporter of Uncle Rico's football camp. Since 1982.
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