I have wintec western, I use it primarily for trails and sometimes arena work when its raining. It fits both of my horses and me well, its very light weight compared to other western saddles, and I like the look of it better then other synthetic saddles. This is the saddle I have Wintec Western Trail Saddle Semi-QH Bars - Horse.com
They also have it in QH bars.
The only complaint I have is that the stirrups don't go short enough for me, but I am 4'11"...
I also believe Abetta is another popular synthetic saddle brand, however I've never ridden in or know anything about them.