The price has come down on the Walther PPS. I just picked one up for $480.00 with the 7 and 8 rnd magazines.
I have the Taurus 709 and the Walther PPS. The PPS is a fantastic shooter. I actually like shooting it better than my Steyr M9A1, and that Austrian pistol is a dream to shoot. The Taurus is a bit smaller(actually it's too small for me) and has a nice trigger in my opinion.
The Beretta Nano is getting mixed reviews but I'd bet it is worth looking at and the MSRP is not in the astronomical category.
I did not like the LC9 at all. The ergonomics were not there for me and the trigger had just about every down side that I could think of. I'm sure that there are those that like it and we all know what opinions are like.