Budget collector here for the most part. I'm wanting to add a few more games in the future. I tend to lean to the 90's games as being my biggest wants, along with a few from the early 2000's. Almost all of my games came in as projects, except for Phantom of the Opera that I got off a fellow pinsider. I prefer projects as I enjoy working on the pins more than playing them at times.
Currently I have:

Jurassic Park - First game, not going anywhere
Phantom of the Opera - Love the Art and Music
Flight 2000 - Needs restoration, re-controlling with MyPinballs custom pinball controller boardset currently
Space Invaders - large project still underway, sat in a wet garage for 20+ years so its taking some time to bring back

I have space for more currently, but I'm building a new house right now so no growth for a while due to funds.
Once I'm in the new place I should have room for ~10 games without upsetting the wife.