I've owned and carried one....... forever
Over 22 years of that frame. I carried a G19 Early Gen 2 for 19 years bumped up to a G23 (identical size...more weight) for 3 years and just went back to a new G19 Gen 4 for work.
I like Glock, but they are not the only game in town as far as striker fired handguns go. I bought my first non-Glock striker fired handgun a month ago...A HK VP9 and after being a Glock user for 22 years, I believe the HK to be better. When you do the math on your $$ for your Blue label (I only purchased those via my PD) that $398 is going to go up a bit in price. It will bring the cost of that Glock close to a VP9 which you can find now for $585. If shooting it with the cheap plastic Glock sights is ok, and you see no need for other odds and ends for it (different disconnector et.al.) then the $398 might get you by
The Walther P99's are raved about as well and like the VP9 will have a substantially better trigger out of the box....substantially.
As far as selling your Blackhawk, I have no idea how much they cost these days, or what you use it for (to me a Blackhawk is for hunting or Target ...maybe Cowboy Action) I would reconsider and save. Being a Ruger I don't think you'll see much cash for it, but I'm sure someone will correct me if I'm wrong. Good luck my friend....and Thank You ...for your service.