and interesting 'option' of alternating between a pellet gun and a normal handgun! i hadn't thought about that - and i think i still have my cheapie BB gun kicking around somewhere (or can pick up a new one for $100 or so). that might even let me get additional 'practice' in a basement or back-yard at times when i can't get to the range for proper discharges.
The cheapie BB gun probably doesn't have the sights or the inherent accuracy you need to be able to switch-out for a real gun. If you are looking to pickup something for extra practice in the garage or basement (check your local bylaws first), you should look at spending closer to $200, something like the Daisy 717 or 747 will give you real sights and really good accuracy. The pellet pistol is an excellent idea; but frankly, I'd buy a good .22 first.
Why?
Because the majority of the benefits of shooting the pellet gun at home can be realized with dry-firing practice with your real gun, plus, you have the benefit of learning that same trigger.
And yes, dry-firing is safe for the vast majority of modern .22s. (ask before you buy).
And don't discount the added life of a good .22rf. For a decent quality .22 bolt, figure 100,000 rounds before it starts to act 'shot-out', as long as you do a fair job of maintaining it. This allows you to get a lot more "trigger time" which is really how you learn to shoot.
I bought my first handgun from Lever Arms Service, way back when Alan Lever still owned it, and it was right downtown. I had enough money for a brand new Ruger Mk1 with a 6" barrel or a very lightly used Ruger SuperBlackhawk (In .44 mag). I was hanging around the handgun display case when Mr. Lever came over, I told him what I wanted (first handgun) and how much I had to spend (I think it was $200) and told him which two I had my eye on.
He asked "Are you stupid?"
I paused a moment, looked around the largest and coolest gunshop I'd ever been in, in my short life, looked at the owner of said establishment, bit-off the smart-mouthed answer I had for him and just said "No sir."
"Good. then buy the .22" So I did. After handing-over my money I asked why, and he basically said all the stuff you've been reading here, you'll shoot it more and it'll last longer.