I've shot a number of striker and hammer operated firearms over the years. As far as those chambered in 9mm are concerned, my personal favorites have been:
Sig SP2022 (VERY inexpensive, comes w/ night sights, can be had for ~$450, sometimes less)
Sig P226/P229 (if you have a few hundred more and prefer a non polymer frame)
Smith Wesson M&P
Springfield XD/XDm
Of the previously mentioned, I think I shoot my M&P9c and the Sig Pro 2022 the best - they just worked for me really really well. My first gun was an XD-9 and they're great! All listed are comfortable for extended sessions and very reliable IMO. The only caveat I can think of is the factory trigger on the M&P is horrible. After installing an Apex Tactical sear (~$40 and 10 min of work) it's a totally different gun - in a good way!
I was also VERY impressed with the 2022. It's "cheap" in price, but feels great in hand, is easy to shoot and is very accurate. It's one of the few polymer framed Sig's and a good few hundred less than its brothers, but it left me thoroughly impressed. I shot it better than I do my own P229.
Edit: Add the Sig P228 to the list. I haven't shot one, but I understand many to consider it to be one of the best balanced 9mm pistols out there. Again, a little more expensive and in line with the prices of a P226 or P229.