My collection peaked at 160 games, currently have about about 85 games, and I'm trying to get down to 50 (including expansions - which I love). I'm finding that I'd rather own games I love and buy expansions for those loved games, then own tons of games that don't get played much. (Modular expansions are the best! So many ways to play!)
Over time, my Top 25 has morphed from a list dominated by medium-heavy euros (Taj Mahal, Princes of Florence, etc.) to one more balanced. It currently includes classic euros (streamlined and fun to wrestle with), a few modern euros, co-ops, Magic: The Gathering, a couple chromey hybrids, and a game that nearly defies description (My current number 5 - Innovation)! I find that 45-60 minute games tend to be more my thing these days. I don't want to deal with the rules density that comes with 90+ minute games.
I used to prefer the balance and control that euros provide, but lately the games I prefer to play most are ones that have a lot of asymmetry and variability in set-up. Agricola has the hand of cards that elicits a different approach with every playing; Innovation is...well, it's Innovation, and all the insanity that it provides. BattleCon provides an interesting duel with highly variable tactics within the matchups and modes. In short, I used to prefer balance and control, now I prefer a unique challenge with every playing, even if that means less balance.
I used to write a lot of reviews for funagain.com back in the early 00's, started the old Terminal City Gamers website, and wrote many session reports on the early days of BGG. I worked a few cons for Uberplay and was lucky enough to meet a bunch of desginers and many of you old-timer geeks! Currently I'm working on an adapted verion of my old site that will focus on some of the basics of the hobby for new players.