Input please?

well since its just practice indoor i would go with a .177 just because its the cheapest to shoot. I would seriously look at used guns and save yourself a few bucks as well.

If you just want to shoot indoors, I'd highly recommend a Weihrauch HW30s in .177. It can be found for around $299 - there are different stock/combo options that can make the price a bit more. I know you don't like springers, but I'm guessing you never tried this springer. Totally different compared to what you'll find in any big box store. It's a beloved favorite for many shooters on this/other forums, from young to old, because of how accurate it is, how easy it is to cock, how hold insensitive it is, and the fact that it comes set up with open sights right out of the box. It's all metal and wood construction yet light weight and won't cause any fatigue. It comes with arguably the best trigger you can find on a springer. It puts out roughly 6 ft/lbs of energy, plenty for your indoor range. It is very quiet as well. I shoot mine at 30 yards and it'll put 5 shot groups within 1/2" easily with a quality scope. I'll link to two videos for you to check out, one being mine. This is my go to plinker when all I want to do is shoot accurate groups and work on my shooting mechanics.

Hey Coach ... good to see you on the forum ... WELCOME!

One thing I would be concerned about on your objective of getting as much practice in as possible in prep for your other interests in the powder burning side of the sport is the amount of time consumed by pumping the gun up. You are in real good shape apparently but that's not what I am talking about. When pumping a pcp airgun you will have to pump a few minutes and then let the pump cool down otherwise you will end up burning the O-rings out of your pump and the Benjamin pump is famous for blowing O-rings.. Then you are faced with a rather time consuming chore of breaking the pump down and replacing the O-rings in the pump. I've had two Benjamin pumps and they both did the same thing. If I were interested in doing what you propose for the reasons you state, methinks I would invest a few extra bucks in a compressor and air tank because the objective is to practice shooting rather than physical training. Pumping is about as entertaining as watching grass grow.

I was thinking about something like Crosman MAR177 pcp conversion kit, you could use your AR lower to practice with.

WELCOME COACH if you go Benjamin or CROSMAN use the 25%off coupon in the banner above free ship friday,,,i would go with the Benjaman MARAUDER INSTEAD OF THE OTHER ITS THE #1 rifle best seller ,pat

Take a look at the air arms T200, It is a little pcp that is pretty nice, and low power for the 10 yard range you have. Really accurate, and won't break the budget.

Champions Choice also offers the T200 PCP. 

Our club uses them with the 4-H group, and also at our indoor 10M matches. 

Sounds like the perfect situation for a C02 gun (or three).