I'm in the same place as Biagio but just a few years behind him.
My first was an HW30S in .177 (which I still have and enjoy regularly). I shot it until the factory spring broke (about 8000 rounds) and then had it repaired and tuned by Rob Hawkins. Like butta!
Next was an AA200, also .177. This fine little rifle has seen a lot use and has introduced me to stuff like chrony use and tuning a PCP. It's been fun and the rifle is more accurate than the shooter so far.
I hand pump (Hill MKiv) but with low volume tank and air efficiency of the AA200 it's not a problem. I will admit to an unhealthy interest in carbon fiber tanks, Shoebox compressors, Omega compressors, etc. and based on reading forums like this one it seems like it's inevitable that I'll "invest" in that stuff eventually just like the rest of the addicts found here.
One of the best purchases so far has been a BT-500 biathlon target from Devin Mfg. My back yard allows me a max of just over 30 yards and I've shot the heck out that thing at that distance! It's super well made-- you can't kill this thing with air gun. My reset cord is a carpenters chalk box, minus the chalk-- works great and super easy to put up after a shooting session with no tangles.
I'm not too much into optics (yet) but I find aperture sights really interesting. An Airforce universal rear sight with a Merit adjustable iris lives on the HW. The AA200 does have a small scope on it-- a Bug Buster 3-9X32AO. Certainly not high-end but works fine for my needs so far. I like to set up a row of 15 or 20 spent .22lr brass at 30 yards and try to hit all of them without a miss, which I have done but usually I do miss a few.
I recently bought a Gehmann 590 rear sight base with a 510 iris for my most recent rifle purchase which is in shipment (expecting delivery on Monday!)-- an HW35. Old school springer that I have always wanted. Can't wait! May have to get the Rob Hawkins treatment right out of the box on this one.
For me, part of the fun of air gunning comes from anticipating future equipment purchases while learning all I can to try to get the most out of the rifles, sights, and gear I have along the way. I'm envious of the guns and gear you guys on AGN have-- it just means that I have a lot to look forward to!
Matt