I would also like to avoid a drawer full of holsters I never use.
I really think there is no getting around this. What I like, you may hate. Everybody is different. Even if you get the worlds best holster, wearing a gun will not be as comfortable as not wearing your gun. You'll see some other holster that looks interesting and think maybe that one is better than what I have and end up trying that one to see if you can find something that is better. We all do it.
I am not sure what holster to get for this thing. Is there kind of an entry level holster the majority of owners think is a good value?
My definition of "entry level" may be different than others, but when I see entry level, I think you don't really know how you want to carry. Either Inside the Waistband (IWB) or Outside the Waistband (OWB), strong side, weak side, more cant, less cant, high ride, lower ride, etc.
For entry level, I recommend a dual use holster. One that will allow different options that will help you decide what you prefer on the first try so you have a better idea of what you want when you inevitably get your second holster.
If you'd like kydex, which I always think is a good match for Glocks, Raven Concealment Systems Phantom
http://rcsgear.com
This is one of the most concealable kydex OWB holsters available (of course, just about every kydex maker now produces a copy of this holster) and with an extra set of attachments, you can wear it either OWB or IWB. You can also adjust the ride height and cant giving you lots of different options to try out with the purchase of just one holster.
If you'd prefer leather, the Simply Rugged Cuda, with the inside/out straps, will also give you the OWB/IWB option as well as cross draw.
http://www.simplyrugged.com/ecommerce/Cuda-.cfm?item_id=407&parent=669
Both are very good holsters in their own right, but the advantage they give to the first time user with all of their adjustability options, makes them both excellent values regardless of what they cost.
The first thing you need to do though, is to get a good gun belt. Even a light gun like the G19 will feel more comfortable with a good belt. At the very least, get a Wildernes Tactical 5-Stitch Instructor belt. They are very lightweight, adjustable, and inexpensive. Make sure you follow their sizing instructions. Your belt size won't be the same as you jeans size. The Frequent Flyer version is probably a good place to start.
http://www.thewilderness.com/tactical-belts/