Mid-fi is where you get the greatest amount of enjoyment for the least amount of cash and audiophilic OCD. Plus, basically all of us still keep some good mid-fi stuff around, because it can be really good as well, and better suited for mobile use, etc.
You'll probably end up being surprised at A) how great some of the gear you'll hear is, and B) how well the stuff you already like stacks up against some considerably more expensive gear. It's cool to start to figure out how your preferences interact with all the gear you read about. I found out, for example, that I really like treble articulation and extension more than I ever thought I would, and that I really dislike the much-ballyhooed HD650s. Horses for courses, strokes for folks. Meets like this are a great way to talk to really cool people and to really get a feel for what suits you best!
As a Beyer guy, though, I have to warn you... The T1 is, in my opinion, truly All That And A Pack of Crackers
™. Listen only at great risk to your wallet!