Hah, when I was in Afghanistan those little crooked bastards were getting "Swocks"... the S&W Sigma 9mms. I remember watching them parading around with their blue lunchboxes. I think that was the day my one buddy got his gnarly old Russian Makarov for like $50.
You can do a lot of work on a Glock with minimal expense. Check out:
Lone Wolf and
Wolff Gunsprings. A zillion other after market sites out there.
Getting your [9mm pistol] with night sights installed and throwing a Streamlight on it would be a good choice as something to do the day you buy it. You need both of those items. I like Streamlight products. I only have the Insight Technologies "tactical illuminators" I do because they were free.