I think a compact polymer auto like the M&P compact or G26/27 is the best compromise on size/weight/capacity/shootability for many people. It looks like the SR9c is in the same size class, but I haven't shot one.
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Kel-Tec PF9, It only has a 7 round mag but you can carry two spares without a problem. Get the belt clip it will disappear under a tight t-shirt and you won't even realize that you are carrying.
Glock19
If you do buy an SR9, do yourself a favor and carry it with the safety off.