Over the years, I've found a few brands which are relatively consistent in quality. With that said, I'm one of those people who can break anything, and I've various guns break down.
When they break, I want good relatively quick customer service; I want a spare gun (I now have several); if fixing myself, I want pretty quick access to parts; and I want references/instructions on how to fix things, even if it's merely Youtube (which is a great resource now-a-days).
I've also got some limitations due to work as to what I can use, which is good as I don't have to consider everything on the market, but bad in that I'm limited to a few brands (if I want to use them for LEO work, instead of only off-duty).
I like the OP's Ruger brand. If I was seriously considering that gun I do a good search for any problems present/prior owners have experienced. I've only heard of this gun, however, and haven't even seen one in person, but I've owned other Ruger guns previously and found them reliable.
For a smallish 9mm, I went with the Glock 43. I'm a big Glock fan, but have had a few which broke down. I've also had a few which didn't work reliably for me. I use the G43 as a backup gun to something more substantial I'd also be carrying.
For the OP, did the revolver idea go away or is this in addition to a revolver? I see you had some questions regarding revolvers in the past. Instead of (or in addition to) the G43, I might, instead, be carrying a J-frame revolver (S&W 442 or 642).
In summary, if I were you, I'd go with the Glock 43 or that Ruger LC9s, once the research has been done as I suggested. I wouldn't bother with Taurus or Charter Arms as I'm good with Glock and S&W. I understand budgets are tough, but that means you don't want to waste time or money getting something which may not work out. You may also be buying only a few guns in your life, compared to others who've got many. Make those purchases count and buy a couple/few popular, recommended, and quality guns and they'll last a lifetime, hopefully.
EDITed to ADD:
I did just a little bit of research and discovered a possible magazine-issue problem with the LC9s. Again, more research may be warranted. See this link:
http://www.luckygunner.com/lounge/ruger-lc9s-60-second-review/