I'm not sure if it's OK to ask about a different brand here, but if not, the mods can delete this.
Now that I have my first handgun, I want more. I'm also thinking the Sigma is a little big to conceal. I've been looking at the Bersa Thunder Pro UC9. Everything I've read has been good. Only problem, I haven't been able to find one around here to look at. I'll probably go to the gun show next weekend and find it there.
Anyone here have thoughts about this pistol?

Well, I'll give you my opinion. I had a Bersa 9 before. It's a good gun. It's heavy and the mags are costly, the ones I found were 35-50 bucks each.
As a comparison betwee nthe Bersa and the Sigma, I would go Sigma. Hard trigger but that's been dicussed a lot already. I have had maybe 5 Sigmas and if I wanted another 9 that was polymer I would get another one. Myself, I tend to go for the older Smiths and the only one I have now is an early model 59.